Posts tagged swaks

Mail relaying test

posted on 2014-08-07 17:06:56

An open Relay might be misused for spamming and is a security issue, so this has to be fixed.

To check if your mailserver is misconfigured, you might use swaks.

swaks --from test@mail.de --to <your-actual@mailaddress.tld> -s <mailserver-hostname-to-test>

Or shorter:

swaks -f asdf@asdf.de -t sjas@mail.de -s my.domain.de

If something along the following lines is shown, you are clear:

[sjas@ctr-014 ~]% swaks --from asdf@asdf.de --to sjas@mail.de --server my.domain.de
=== Trying my.domain.de:25...
=== Connected to my.domain.de.
<-  220 my.domain.de ESMTP Postfix
-> EHLO ctr-014.intranet.centron.de
<-  250-my.domain.de
<-  250-PIPELINING
<-  250-SIZE 10240000
<-  250-ETRN
<-  250-STARTTLS
<-  250-AUTH PLAIN LOGIN
<-  250-AUTH=PLAIN LOGIN
<-  250-ENHANCEDSTATUSCODES
<-  250-8BITMIME
<-  250 DSN
-> MAIL FROM:<asdf@asdf.de>
<-  250 2.1.0 Ok
-> RCPT TO:<sjas@mail.de>
<** 554 5.7.1 <sjas@mail.de>: Relay access denied
-> QUIT
<-  221 2.0.0 Bye
=== Connection closed with remote host.
[sjas@ctr-014 ~]% 

To just test regular mailing capabilities, this suffices on the current server:

swaks -f root@`hostname -f` -t sjas@mail.de

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