mhf13's profile

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8 Messages

Saturday, February 21st, 2026 7:54 PM

Blocking email access from Starlink

When I am connected to my starling router I cannot send e-mail from my MacBook / ThunderBird or any of my iPhones/iPads using the Apple mail app. I can receive e-mail, but I have to input the password multiple time on my iPhone/iPad.  If I use direct cellular networking I have no problems sending or receiving e-mail.

I get the following message when trying to send email via a Starlink connection:

Sending of the message failed.
An error occurred while sending mail: Outgoing server (SMTP) error. The server responded:  resomta-a2p-646770.sys.comcast.net resomta-a2p-646770.sys.comcast.net Excessive failed authentication, ESMTP server temporarily not available.

I can only conclude that Xfinity mail servers are not configured to properly accept connections from connections via Starlink.

Hopefully there is an easy fix.

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27.1K Messages

2 hours ago

... Excessive failed authentication ...

This usually means that one or more of your devices is repeatedly trying to log in to the mail system, but is supplying an incorrect ID or password. Eventually the system will lock you out for a period of time. Double-check your settings at https://www.xfinity.com/support/articles/email-client-programs-with-xfinity-email.

The Comcast Security Assurance group (see https://spa.xfinity.com/contact-us) may or may not be willing and able to help you. If not, you'll have to locate the troublemaker yourself. https://forums.xfinity.com/conversations/email/possible-solution-for-unable-to-connect-to-email-from-apple-maybe-other-devices-after-changing-comcast-password/65a1a8fbf961c6163a367c6f describes one approach.

(edited)

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