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Visitor

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2 Messages

Friday, May 30th, 2025 1:12 AM

Error occurred while sending mail: Outgoing server (SMTP) error

I recently installed a VPN desktop app on my Windows 11 PC. I use Thunderbird as the email client app on my PC. With the VPN deactivated, I successfully receive emails via Thunderbird and can also successfully send emails. When the VPN is activated, I successfully receive emails via Thunderbird, but cannot send emails. When I try to send an email, I get the following error message: "Sending of the message failed. An error occurred while sending mail: Outgoing server (SMTP) error. The server responded: resomta-h2p-555059.sys.comcast.net resomta-h2p-555059.sys.comcast.net ESMTP server not available (212238/143.244.47.90)." Again, Thunderbird can send emails when the VPN is deactivated but cannot send emails (resulting in the above error message) when the VPN is activated.

Does anyone have any suggestions for resolving this issue?

Official Employee

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346 Messages

2 months ago

Hello @user_6yyvmg. Thank you for reaching out on our community Forum. Sometimes VPN's can be tricky. Here is an article that may help. Let me know if you have further questions.Link

Gold Problem Solver

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26.5K Messages

2 months ago

... Thunderbird can send emails when the VPN is deactivated but cannot send emails (resulting in the above error message) when the VPN is activated. ...

VPN's have lots of legitimate uses, but they are also a magnet for spammers and scammers whose activities "poison" the VPN's IPs. Sending email using a VPN is likely to always be iffy.

Please be aware that there are 2 kinds of responses in this Forum: Replies and Comments. When you Comment on a post by scrolling down to "Comment on this post here...", I am notified of your response. But if you select Reply, I am NOT notified and may not be aware of your response.

Visitor

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2 Messages

1 month ago

@XfinityAbby @BruceW Thanks for your replies. So I take it that there are no Xfinity persons or resources that can help resolve my VPN-related issue so I can send emails?

Official Employee

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3.3K Messages

 

Our troubleshooting for VPN issues is limited. Have you tried reaching out to the email client of the VPN client for troubleshooting support? They may have better information to assist with the issue.

 

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