If you have a domain name registered with KartHost and you use the Email Forwarding feature on that domain — meaning you have aliases like info@yourdomain.com set to forward to your personal Comcast, Yahoo, Gmail, or other inbox, with no actual mailbox at your domain — this post is for you. Please read it carefully.
Domain name email forwarding failures are not from any KartHost change — it is a feature the industry’s new email security standards have made increasingly unreliable and beyond our ability to fix or support.
What KartHost can do is help you move to a solution that works. By upgrading to a real hosted email mailbox at your domain — through KartHost’s KloudEmail or Microsoft 365 — your email will be properly authenticated, reliably delivered, and fully supported. KartHost will handle the DNS configuration to get everything set up correctly, so you do not have to figure it out on your own.
KartHost is sharing this now so you have time to prepare and move to a solution that works before you lose email entirely.
For new domain name registrations going forward, KartHost will no longer be activating the Email Forwarding feature. For existing customers already using it, your forwarding is not being forcibly removed — but we strongly encourage you to make the move to a real hosted mailbox as soon as possible. Here is everything you need to understand and do.
What Is Domain Email Forwarding — And Why You Used It
Domain email forwarding is a feature that lets you point an address like info@yourdomain.com to a personal inbox — for example, your @comcast.net or @gmail.com address. It required no paid email account, no setup beyond a few clicks, and for many years it worked without issue.
Those days are over. Not just at KartHost — across the entire email industry.
Why It Stopped Working
1. Comcast Handed Its Email Over to Yahoo
Starting June 2025, Comcast began migrating all @comcast.net mailboxes to Yahoo Mail’s infrastructure in phased waves continuing through 2026. Your email address stays the same — you keep your @comcast.net address — but Yahoo now controls the filters, spam detection, and delivery rules behind it. Yahoo enforces authentication standards far more strictly than Comcast’s old system ever did.
There is one more critical thing Comcast.net customers need to know: when your account migration invitation arrives, you must accept Yahoo’s Terms of Service within 120 days. If you do not, your account is permanently closed, your address is gone, and all email is lost. Forwarding rules and filters you had set inside Comcast’s old webmail do not carry over — those must be recreated inside Yahoo Mail after migration.
2. The Entire Email Industry Enforced Authentication — And Forwarding Does Not Pass
Since early 2024, Google, Yahoo, and Microsoft have been requiring every sending domain to have SPF, DKIM, and DMARC records in place — and they now enforce that requirement strictly with no grace period:
- Yahoo began requiring DMARC compliance in February 2024.
- Google/Gmail began rejecting non-compliant mail outright in November 2025.
- Microsoft enforced the same standards starting May 2025.
Domain email forwarding runs directly into these requirements every single time — and fails.
Here is the plain-language explanation.
When someone emails info@yourdomain.com and Enom forwards it to your Comcast/Yahoo inbox, Yahoo receives the message from Enom’s servers. Yahoo then checks: “Is Enom authorized to send email on behalf of this original sender?” The answer is almost always no — Enom is not listed in the original sender’s security records.
That check fails. Yahoo rejects or junks the message — regardless of how correctly your own domain’s DNS records are configured. Adding SPF, DKIM, and DMARC records to your domain helps authenticate mail you send from your domain. Those records cannot fix what Yahoo does with forwarded mail arriving through Enom’s servers from third-party senders.
The technical root cause is that Enom’s domain forwarding does not support SRS (Sender Rewriting Scheme) — a mechanism that would rewrite the sender information during forwarding so that the authentication check would pass. Without SRS, there is no DNS-level workaround.
Domain email forwarding is being retired across the entire industry because it is structurally incompatible with modern email authentication standards. This is not a temporary glitch or a condition that will reverse. Universities — institutions that relied on email forwarding for decades — have been among the most visible to act on this:
- Kansas State University disabled all automatic email forwarding in March 2025.
- UC Davis ended email forwarding in 2024, calling it “not sustainable” and citing “serious security and privacy risks.”
- Colorado State University banned rule-based forwarding from Microsoft 365 to external accounts effective October 2025.
- University of Maryland Baltimore blocked all auto-forwarding starting June 2024.
SpamResource, one of the most respected email deliverability publications in the industry, stated directly that email forwarding methodologies “were eventually going to be doomed” — and that SPF “is just not forwarding friendly.”
Gmail permanently removed its own “Check mail from other accounts” POP3 fetch feature in January 2026, eliminating one of the most common workarounds users had relied on when forwarding broke.
Domain email forwarding is not a feature with a bug. It is a feature that the modern internet has moved past.
There is a hidden problem with domain email forwarding that most customers never realize until someone points it out.
When a customer emails info@yourdomain.com and Enom forwards it to your Comcast or Yahoo inbox, and you hit Reply — your reply does not go out from info@yourdomain.com. It goes out from your @comcast.net or @yahoo.com address. The person you are replying to now sees your personal inbox address, not your professional domain address.
Every reply you send, every conversation you have — your business identity is invisible. You look like a personal Gmail or Comcast user, not a professional business operating from your own domain. This has always been a limitation of blind email forwarding and is another reason why forwarding was never a true business email solution — it was always a shortcut with a cost.
Your Solution: A Real Hosted Mailbox
The fix is to replace domain email forwarding with a real hosted email mailbox at your domain. This solves the problem completely — your domain aliases deliver to your mailbox reliably, and you never depend on forwarding to a personal inbox again.
KartHost offers two options. Use the comparison charts below to find what fits your needs:
Option A — KloudEmail (Hosted Business Email) Basic or Suite
Business-class email powered by Rackspace. No ads, no tracking, full IMAP/SMTP access, generous storage, and rock-solid deliverability. Perfect for individuals and businesses who want professional email without the Microsoft ecosystem.
KloudEmail also supports unlimited email aliases on your domain — so all of your existing addresses like info@, sales@, support@, or any others you have been forwarding can be pointed to your real mailbox at no extra cost.
Option B — Microsoft 365 (Email Only or Full Productivity Suite)
Includes Exchange-powered email plus the full Microsoft 365 suite — Word, Excel, PowerPoint, Teams, OneDrive, and more. The right choice if you want your email and productivity tools under one subscription.
Microsoft 365 supports up to 400 email aliases per user at no additional cost or license required — far more than most small businesses will ever need. All of your existing forwarding addresses can be recreated as aliases delivering directly to your mailbox.
Microsoft 365 customers get the best experience accessing their
mailbox directly through the Outlook desktop app or Outlook mobile
app — both included with every M365 subscription.
Once You Have a Real Mailbox — The Right Way to Use It
Once your KloudEmail or Microsoft 365 mailbox is set up and KartHost has updated your DNS, every email you send and every reply you make goes out properly from your domain address — info@yourdomain.com, sales@yourdomain.com, or whichever address you use. Fully authenticated. Professionally presented. No personal inbox address in sight.
This is the moment to remove the personal inbox middleman entirely.
You do not need Comcast, Yahoo, or Gmail in the middle of your business email anymore. A professional hosted mailbox works best when you access it directly — and the tools to do that are simple, free or low cost, and available on every device you already own.
On Your Desktop or Laptop — Use a Professional Email Client
A desktop email client connects directly to your KloudEmail mailbox using IMAP and lets you send and receive from your domain address with no middleman involved. Three excellent options:
Mailbird — a clean, fast Windows email client that handles multiple accounts beautifully. Free version available. mailbird.com
Thunderbird — free, open source, and trusted by millions. Works on Windows and Mac. thunderbird.net
Microsoft Outlook — included with Microsoft 365 subscriptions. The most full-featured option if you are on M365. Already on most Windows computers.
All three connect to your KloudEmail or M365 mailbox in minutes using IMAP. KartHost can provide the exact settings when you open your setup support ticket.
On Your Phone or Tablet — Use the Built-In Mail App
You do not need to download anything special. Every iPhone and Android phone has a built-in Mail app that connects directly to any IMAP mailbox in minutes.
On iPhone/iPad — go to Settings → Mail → Accounts → Add Account → Other → Add Mail Account. Enter your name, domain email address, password, and the IMAP settings KartHost provides.
On Android — open the Gmail app or the built-in Email app, tap Add Account → Other, and enter your domain email address and IMAP settings.
Your domain email will appear alongside any other accounts on your phone and send from your professional address every time.
If You Still Want to Read Email in Yahoo or Gmail — Here Is How to Also Send From Your Domain Address
We strongly recommend accessing your professional mailbox directly using an email client as described above. However, if you prefer to continue reading email inside Yahoo Mail or Gmail, you can also configure those services to send and reply FROM your domain address — so recipients always see your professional address, not your personal one. This requires your KloudEmail or Microsoft 365 mailbox to already be set up and working.
Important — KloudEmail/Rackspace Webmail Setting:
If you have ever set up forwarding inside your KloudEmail webmail
(Settings → Incoming → Forward), you must log into your KloudEmail
webmail and verify that the “Keep a copy in inbox” checkbox is checked.
If this box is not checked, forwarded mail is deleted from your
KloudEmail server immediately after forwarding — meaning your email
client, Yahoo Mail, or any other device trying to fetch via IMAP
will find an empty inbox. Nothing will sync.
To check this setting:
1. Log into KloudEmail webmail
2. Go to Settings → Incoming → Forward
3. Confirm “Keep a copy in inbox” is checked
4. Save if you make any changes
Yahoo Mail — Send From Your Domain Address
After adding your KloudEmail mailbox to Yahoo Mail (following the pull steps above), you can configure Yahoo to send from your domain address:
1. Log into Yahoo Mail at mail.yahoo.com
2. Click the gear icon → More Settings
3. Click Mailboxes
4. Select your added mailbox
5. Under the sending settings, enter your domain email address and SMTP credentials
KloudEmail SMTP settings:
Server: secure.emailsrvr.com | Port: 465 | SSL: Yes
For full step-by-step instructions direct from Yahoo, visit Yahoo’s official help page:
https://help.yahoo.com/kb/add-remove-email-accounts-yahoo-mail-sln26459.html
Gmail — Send From Your Domain Address
Gmail’s “Send mail as” feature is still fully supported in 2026 even after the POP3 fetch removal. Once your KloudEmail mailbox is set up, you can add your domain address to Gmail so every email and reply you send shows your professional address:
1. Log into Gmail
2. Click the gear icon → See all settings
3. Click the Accounts and Import tab
4. Under Send mail as — click Add another email address
5. Enter your name and domain email address
6. Enter your SMTP server details (below)
7. Gmail sends a verification email to your domain mailbox — click the link to confirm
8. Once verified, when composing in Gmail choose your domain address from the From dropdown
KloudEmail SMTP settings:
Server: secure.emailsrvr.com | Port: 465 | SSL: Yes
For full step-by-step instructions direct from Google, visit Gmail’s official help page:
https://support.google.com/mail/answer/22370
Note: Even with Send mail as configured in Yahoo or Gmail, we still
recommend transitioning fully to a professional email client over time.
It gives you a cleaner, faster experience and keeps your business email
working consistently across all your devices from one professional
mailbox.
KartHost’s support covers your KloudEmail mailbox and DNS
configuration — once mail leaves our server to a third-party app or
service, support for that experience rests with that platform.
What You Need to Do — Right Now
Why wait? If domain email forwarding is your only way of receiving email at your domain address, your mail is likely already being rejected or junked — and it will not improve on its own.
- Purchase a KloudEmail or Microsoft 365 mailbox through the KartHost Customer Center — compare plans using the links above
- Open a support ticket in the KartHost Customer Center — KartHost will handle the DNS reconfiguration to connect your domain aliases to your new mailbox correctly
- If you use Comcast/Yahoo — after your Comcast account migrates to Yahoo, follow the steps above to have Yahoo pull mail from your new mailbox (KloudEmail or M365). Now when you reply use your domain address not Comcast/Yahoo
- Update anyone who needs to know — if your team, clients, or vendors send to your domain aliases, nothing changes on their end; your addresses stay exactly the same
We Are Here to Help You Move Forward
KartHost has been providing email and domain solutions since 2000.
We understand how frustrating it is when something that has worked
reliably for years suddenly stops working — and you did not change
a thing. We hear it often: “It has always worked this way” or
“Nothing changed on my end, why is it broken?” That frustration
is completely valid.
The honest answer is that the internet changed — not you, and not
KartHost. Email security standards that major providers now enforce
across the board have made domain name email forwarding increasingly
unreliable. This is happening to customers everywhere regardless of
who hosts their domain or where their email forwards to.
We are not sharing this to push you toward a paid service. We are
sharing it because we believe you deserve to know what is actually
happening and why — so you can make the right decision for your
business before you lose email entirely. A real hosted mailbox is
not an upsell. It is simply the way professional email works in
2026, and it is what gives you a reliable foundation that will not
break when the industry changes its rules again.
KartHost is here to help you make that transition as smoothly as
possible — at your pace, with support every step of the way.
