DESCRIPTION

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.

SYNOPSIS

  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 JSON

SEE ALSO

Perl class interface Net::SMTP::Verify