Hi Jeremy,

> On 20 Apr 2025, at 10:36, Jeremy Harris via Exim-users 
> <exim-users@lists.exim.org> wrote:
> 
> On 2025/04/19 4:36 PM, Sander ter Steege via Exim-users wrote:
>> But I do not understand why the From line Thunderbird is not used, because 
>> there is one and from the looks of it in the debugging output it is valid.
> 
> OK, we'd need to see that debug run to comment further.

Great, thanks for your help as I try to understand what is happening and not 
just fix something without knowing why it worked (or was needed).

This is the log I made with the debug console in Thunderbird (I replaced the 
actual mail addresses and server name): 

mailnews.smtp: Sending message 
<d61f954e-88b8-4a36-bdb1-2fdaae74d...@example.com> 
OutgoingServerService.sys.mjs:89:18
mailnews.smtp: Connecting to smtp://newserver:465 SmtpClient.sys.mjs:132:19
mailnews.smtp: Connected SmtpClient.sys.mjs:429:17
mailnews.smtp: S: 220-newserver MailServer 

220 Authorized use only.

SmtpClient.sys.mjs:452:17
mailnews.smtp: C: EHLO [192.168.10.130] SmtpClient.sys.mjs:677:19
mailnews.smtp: S: 250-newserver Hello [192.168.10.130] [192.168.10.130]

250-SIZE 20971520

250-LIMITS MAILMAX=1000 RCPTMAX=50000

250-8BITMIME

250-AUTH PLAIN LOGIN

250-CHUNKING

250-PRDR

250 HELP

SmtpClient.sys.mjs:452:17
mailnews.smtp: Possible auth methods: PLAIN,LOGIN SmtpClient.sys.mjs:959:17
mailnews.smtp: Current auth method: PLAIN SmtpClient.sys.mjs:717:17
mailnews.smtp: Authentication via AUTH PLAIN SmtpClient.sys.mjs:732:21
NS_ERROR_FAILURE: Couldn't decrypt string crypto-SDR.sys.mjs:197
mailnews.smtp: C: Logging suppressed (it probably contained auth information) 
SmtpClient.sys.mjs:673:19
mailnews.smtp: S: 235 Authentication succeeded

SmtpClient.sys.mjs:452:17
mailnews.smtp: Authentication successful. SmtpClient.sys.mjs:1189:17
mailnews.smtp: C: MAIL FROM:<u...@example.com>> BODY=8BITMIME SIZE=516 
SmtpClient.sys.mjs:677:19
mailnews.smtp: S: 250 OK

SmtpClient.sys.mjs:452:17
mailnews.smtp: MAIL FROM successful, proceeding with 1 recipients 
SmtpClient.sys.mjs:1224:17
mailnews.smtp: Adding recipient... SmtpClient.sys.mjs:1229:17
mailnews.smtp: C: RCPT TO:<remote_u...@gmail.com> SmtpClient.sys.mjs:677:19
mailnews.smtp: S: 250 Accepted

SmtpClient.sys.mjs:452:17
mailnews.smtp: Total RCPTs during this connection: 1 SmtpClient.sys.mjs:1291:19
mailnews.smtp: RCPT TO done. Proceeding with payload. SmtpClient.sys.mjs:1294:19
mailnews.smtp: C: DATA SmtpClient.sys.mjs:677:19
mailnews.smtp: S: 354 Enter message, ending with "." on a line by itself

SmtpClient.sys.mjs:452:17
mailnews.smtp: Sending 516 bytes of payload SmtpClient.sys.mjs:645:17
mailnews.smtp: S: 250 OK id=1u1Opo-00000005Kax-1w9u

SmtpClient.sys.mjs:452:17
mailnews.smtp: Message sent successfully. SmtpClient.sys.mjs:1353:21
mailnews.smtp: Start 5 second QUIT timer SmtpClient.sys.mjs:1378:21
mailnews.smtp: C: QUIT SmtpClient.sys.mjs:677:19
mailnews.smtp: S: 221 newserver closing connection

SmtpClient.sys.mjs:452:17
mailnews.smtp: Socket closed. SmtpClient.sys.mjs:573:17
mailnews.smtp: Connection to newserver closed

—-
Regards,

Sander

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