https://bugs.exim.org/show_bug.cgi?id=1832
--- Comment #4 from Sander Hoentjen <sander@???> ---
I created an expect script to reproduce:
# cat smtp_server.expect
================
#!/usr/bin/expect
spawn nc -l <some_ip> 25
#stty -echo
exp_internal 1
expect -re ".*" {send -- "200 blabla.example.com ESMTP\r"}
expect {
timeout {puts "timed out"; exit 42}
eof {puts "eof"; exit 99}
-re "EHLO*" {send -- "421 5.5.0 Your IP has been blacklisted.\r"}
-re "HELO*" {send -- "421 5.5.0 Your IP has been blacklisted.\r"}
}
set timeout 1
expect {
timeout {puts "timed out"; exit 42}
}
================
I can reproduce the problem with above script. Exim connects, script sends "200
blabla.example.com ESMTP"
exim sends EHLO, script replies with 421 and disconnects a second later
I guess one option would be to always log the reply to the EHLO, before
continuing to try the HELO.
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