Am Fri, 29 Jan 2021 10:39:16 +0530 schrieb "Amol Kale" amol@talentrackershr.com:

Hi,

We are looking for a tool for bulk SMTP testing / Email validation using telnet or similar protocol ( which doesn't send the mails )

It generally involves steps like NSlookup to check MX of destination server, opening port25, telnet to communicate with client server, then finally checking the correctness of user email account.

Please connect if you have such ready tool with you or you can develop

Process example- https://blog.mailtrap.io/verify-email-address-without-sending/ https://blog.mailtrap.io/verify-email-address-without-sending/

Thanks & regards

Amol Kale

Founder Director

Talent Trackers HR

7350002596

Hi,

I would recommend using the Swiss Army Knife for SMTP (swaks) for this. It should be already included in most Linux distributions. Otherwise you can find it here: https://github.com/jetmore/swaks

You can check the whole SMTP-Protocol chain, or you can tell swaks after which step to abort. Your use case would be stopping after RCPT, so you would start it using the extra flag "-q RCPT"

Julian

--

| | Julian Kippels | | M.Sc. Informatik | | | | Zentrum für Informations- und Medientechnologie | | Heinrich-Heine-Universität Düsseldorf | | Universitätsstr. 1 | | Raum 25.41.O1.32 | | 40225 Düsseldorf / Germany | | | | Tel: +49-211-81-14920 | | mail: kippels@hhu.de

On 2021-01-29 06:09, Amol Kale wrote:

Process example- https://blog.mailtrap.io/verify-email-address-without-sending/ [1]

i think we are very offtopic, but "sendmail -bv root" could be a start