Thunderbird email bounce back: error SMTP 550-5.7.1 Messages with multiple addresses in From: header are not accepted.
Thunderbird is creating an email with multiple "From"s?! creating and adding to the "From" an email address {based on my server name} that it has invented and I have never entered! It's trying to send email for me, like this: "From: [dummy]@[dummy].netvision.net.il, [actual sender address is here]" Thunderbird is adding this [dummy]@[dummy].netvision.net.il I've removed the identifying information and added "[dummy]" instead ... what's going on here!!?? So I am getting a bounce back problem -- especially with the gmail.com servers/addresses.
Full info from bounce back: Reason: SMTP transmission failure has occurred
Diagnostic code: smtp;550-5.7.1 [194.90.9.20 13] Messages with multiple addresses in From: header are not accepted. 20-v6si5353619wmb.84 - gsmtp Remote system: dns;gmail-smtp-in.l.google.com (TCP|194.90.9.20|51726|173.194.76.27|25) (mx.google.com ESMTP 20-v6si5353619wmb.84 - gsmtp)
Reporting-MTA: dns;mxout1.netvision.net.il (tcp_local-daemon) Arrival-date: Mon, 23 Jul 2018 09:55:33 +0300 (IDT) Original-recipient: <removed gmail account address> Final-recipient: rfc822;<removed gmail account address> Action: failed Status: 5.7.1 (SMTP transmission failure has occurred) Remote-MTA: dns;gmail-smtp-in.l.google.com
(TCP|194.90.9.20|51726|173.194.76.27|25) (mx.google.com ESMTP 20-v6si5353619wmb.84 - gsmtp)
Diagnostic-code: smtp;550-5.7.1 [194.90.9.20 13] Messages with multiple
addresses in From: header are not accepted. 20-v6si5353619wmb.84 - gsmtp
As you can see the ISP is netvision.net.il (MSWin firewall, no AV--too slow a computer) I am using an old computer and XP, but I doubt that's the problem: HP with Intel E2180 @ 2GHz CPU + 1GB of RAM. Win XP Pro 2002 SP3.
Chosen solution
Good News... looking at the settings screen again (like you asked me to do) made me notice something... I had added an "@" in the "Your Name:" box [format was: "Info @ <the-non-for-profit-I-work-for>"] ... so I am pretty sure I just figured out what happened... The Thunderbird programmers got overzealous! - they programmed Thunderbird to scan this @ (in the "Your Name:" edit box) as a marker that there was an email address there--> this should not be - as it controls the display name tag that appears in the email header and should not create an address to be added/appended to the "From:" list of addresses. The Google mail server saw this double "From address(es)" and rejected the message and sent it back with the SMTP 550-5.7.1 error code. I tested my theory and changed "@" with "at" and the message got through to my email address at gmail.com. But this IS a bug. Thunderbird should not be reading the input of the "Your Name:" edit box as an email to be added to the "From:".
Read this answer in context 👍 0All Replies (7)
Right click the account in the folder pane and select settings In account settings check the email Address and replyto address.
Of course I checked that before I posted my question. Everything there is correct. That's why I said that Thunderbird is generating that bogus email address and adding it to the From.
But thank you for answering so quickly. Thunder bird is putting two addresses in the From, one of which is a bogus one based on the server name. It's really weird
Chosen Solution
Good News... looking at the settings screen again (like you asked me to do) made me notice something... I had added an "@" in the "Your Name:" box [format was: "Info @ <the-non-for-profit-I-work-for>"] ... so I am pretty sure I just figured out what happened... The Thunderbird programmers got overzealous! - they programmed Thunderbird to scan this @ (in the "Your Name:" edit box) as a marker that there was an email address there--> this should not be - as it controls the display name tag that appears in the email header and should not create an address to be added/appended to the "From:" list of addresses. The Google mail server saw this double "From address(es)" and rejected the message and sent it back with the SMTP 550-5.7.1 error code. I tested my theory and changed "@" with "at" and the message got through to my email address at gmail.com. But this IS a bug. Thunderbird should not be reading the input of the "Your Name:" edit box as an email to be added to the "From:".
The input of your name is and always will be included in the From.
It is concatenated with the your name information followed by a < then the email address and a closing > is that not what is showing?
I understand, but because I used the name: "Info @ Your Neighbor" format - with the "@" in the name: Thunderbird took this and spit out, NOT name+address, BUT the following (comma separated) TWO ADDRESSES in the "From:" "From: Info@YourNeighbor.incomingmailservername, info@domainname.com" When I removed the "@" symbol from the "name" section, the problem went away. Thank you!
Modified by Nate.W
I strongly suggest you file a bug report. That should not happen. It may have been an unintended side product of the "customize from address" implementation.