smtp-verify could be used to test if mail can be delivered to recipients.
It uses MAIL FROM and RCPT TO commands to test if recipients exist.
Additional checks available are:
- check message size and mailbox quotas
-
If a message size is give and the server supports the SIZE extension it will check if the server will accept the size of the message.
- check for STARTTLS
-
It will check if the STARTTLS extension is available.
- check for TLSA record of MX
-
It will check a TLSA for the MX has been published.
This also requires that your resolver sets the 'ad' flag.
- check for OPENPGPKEY record of recipients
-
It will check a OPENPGPKEY for the recipient address has been published.
This also requires that your resolver sets the 'ad' flag.
If the server provides the PIPELINING extension smtp-verify will send RCPT commands in bulks.
usage: smtp-verify [-?bdfHhjnpsst] [long options...]
-h -? --usage --help Prints this usage information.
-n STR --helo_name STR name to use in EHLO
-H --host query this host instead of MX
-p INT --port INT port to use (default 25)
-t INT --timeout INT smtp timeout (default 30s)
-a --tlsa lookup if TLSA record is available
-o --openpgpkey lookup if OPENPGPKEY records are
available
-d --debug print debug info to STDERR
-b INT --rcpt_bulk_size INT how many RCPTs to send in one bulk
when PIPELINING (default 10)
-f STR --from STR address to use in MAIL FROM
-s INT --size INT how many RCPTs to send in one bulk
when PIPELINING (default 10)
-j --json output JSONPerl class interface Net::SMTP::Verify
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