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Editorial Team
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Asked: 2026-06-06T01:05:03+00:00

I have a problem with the esmtp application that I really hope you help

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I have a problem with the esmtp application that I really hope you help me with.

The thing is that I am trying to connect to a smtp server at one.com which needs authorization. But it seems like that esmtp won’t issue the AUTH command.

I have set up the esmtprc file as follow:

hostname = send.one.com:25
username = "username"
password = "password"

I issue this command which fails:

echo "Hello" | esmtp -f xxx@xxx.dk -v -C esmtprc -X smtplog.txt xxx@xxx.se

The log file now includes:

S: 220 csmtp3.one.com ESMTP
C: EHLO xxx
S: 250-csmtp3.one.com
250-PIPELINING
250-SIZE 104857600
250-VRFY
250-ETRN
250-STARTTLS
250-AUTH PLAIN LOGIN
250-AUTH=PLAIN LOGIN
250-ENHANCEDSTATUSCODES
250-8BITMIME
250 DSN
C: MAIL FROM:<xxx@xxx.dk>
S: 250 2.1.0 Ok
C: RCPT TO:<xxx@xxx.se>
S: 553 5.7.1 <xxx@xxx.dk>: Sender address rejected: not logged in
C: QUIT
S: 221 2.0.0 Bye

I was expecting an AUTH command just before the “MAIL FROM” command.

I don’t know which version of esmtp that I use.

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1 Answer

  1. Editorial Team

    I found the problem. The sasl-plain.so couldn’t be found. When it was made available, the authentication was no problem.

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