Regular Visitor
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6 Messages
5 Accounts Using Same SMTP Settings but One Can't Send Emails
Until recently, I had no issues sending emails via Apple Mail (v. 16). There are five email accounts all using the same outgoing mail server. Three of the accounts are Comcast, one is Yahoo, and one is iCloud. Of those 5 accounts using the same outgoing mail server, 4 work fine. Unfortunately, I can no longer send emails from my primary Comcast account (The other two Comcast accounts are fine). This problem only applies to emails I attempt to send from my laptop. I can still send emails from my primary account on my mobile device and from the Xfinity webmail page. The SMTP settings are, of course, the same for all 5 accounts. The Mail Connection Doctor says everything is fine.
This is the message I get when I try to send an email from my primary Comcast account:
The sender address (#########@comcast.net) was rejected by the server smtp.comcast.net.
The server response was: Please ensure your email address and authenticating user match when sending messages
Select a different outgoing mail server from the list below or click Try Later to leave the message in your Outbox until it can be sent.
If I use a different outgoing mail server, I can get the email to send. I just can't use the Comcast settings BUT ONLY ON THIS ONE COMCAST EMAIL ACCOUNT. Any ideas?
BruceW
Gold Problem Solver
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26.2K Messages
1 year ago
The message simply means that if, for example, the email you are sending has a "From:" address of "user1(at)comcast.net", client programs and apps must be configured so that when they log in ("authenticate") to the server to send that message they do so using that same username: "user1(at)comcast.net". They added this requirement a some months ago and IIRC grandfathered nonconforming accounts for an limited but unspecified time period. Please see https://forums.xfinity.com/conversations/email/cannot-connect-with-smtp-outbound-server/6377f10cb768a260608d48d2?commentId=63e5362165f3ed11c94e4003.
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XfinityShawn
Official Employee
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1.2K Messages
1 year ago
@innisart Our team can help you with your email concerns today. To send a direct message, please click on the chat icon in the top-right corner of the screen, and select "Xfinity Support" to initiate a live chat.
Click "Sign In" if necessary
Click the "direct messaging" icon or https://forums.xfinity.com/direct-messaging
Click the "New message" (pencil and paper) icon
Type "Xfinity Support" in the "To:" line and select "Xfinity Support" from the drop-down list which appears. The "Xfinity Support" graphic replaces the "To:" line
Type your message in the text area near the bottom of the window
Press Enter to send it
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