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Get error trying to send email using Thunderbird and VPN

Frequent Visitor

Get error trying to send email using Thunderbird and VPN

Hi, I get the following message when trying to use Thunderbird to send email while connected through my VPN service (IPVanish). 

 

"An error occurred while sending mail: The mail server sent an incorrect greeting:  resomta-po-09v.sys.comcast.net resomta-po-09v.sys.comcast.net CSI IP 64.145.94.234 is not permitted to send messages.  Please contact support if you feel this is in error.."

 

This just started happening in the last 2-3 weeks, was working fine before that.

 

Thanks

KR

Tags (3)
Frequent Visitor

Re: Get error trying to send email using Thunderbird and VPN

My guess is that Comcast does not want any of their customers using a VPN and is taking measures to discourage such use. I'm also sure that there will be a way to defeat Comcast's efforts soon.

Frequent Visitor

Re: Get error trying to send email using Thunderbird and VPN

I ended up calling Xfinity/Comcast tech support. I talked to a level 1 person who couldn't help, so he wrote up a ticket to pass to level 2 support. I got a call back from level 2, and the person wanted me to remove the comcast account from Thunderbird, and then add it back. I didn't want to do that without a full backup, so did not take any action. Then last night, I accidently replied to an email without thinking, while still running through the VPN, and - it worked! Has been working all day today also. I haven't changed anything on my system. So I'm wondering if that's coincidence or if some intrepid level 2 support person followed up and actually fixed the problem on their end. In any case, it's working again, so I'm happy :-)

Frequent Visitor

Re: Get error trying to send email using Thunderbird and VPN

Sigh, spoke too soon, it's broken again. But it's obviously nothing to do with how Thunderbird is set up. 

Frequent Visitor

Re: Get error trying to send email using Thunderbird and VPN

Same issue here. This is 100% on Comcast. They can't or won't fix it, you pick.