Jun 102011
 

Normally, to check if my server smtp connection alive, I just do telnet to port 25 from my workstation. if the smtp banner displayed, it means that the connection to the smtp server is good. I have done this for years.  😆

$ telnet smtp.example.com 25
Trying xxx.xxx.xx.xxx...
Connected to xxx.xxx.xx.x.
Escape character is '^]'.
220 smtp.example.com ESMTP Postfix
ehlo host.example.com
250-smtp.example.com
250-PIPELINING
250-SIZE 52428800
250-ETRN
250-STARTTLS
250-AUTH LOGIN PLAIN
250-AUTH=LOGIN PLAIN
250-ENHANCEDSTATUSCODES
250-8BITMIME
250 DSN
quit
221 2.0.0 Bye
Connection closed by foreign host.

Although many tools that are deliberately created for this purpose, still, I prefer just using telnet to port 25. I have made a simple perl script, with the intention that the things I do for years manually can be done automatically.

Modules required:

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