--mail-rcpt

Specify a single email address, username or mailing list name. Repeat this option several times to send to multiple recipients.

When performing an address verification (VRFY command), the recipient should be specified as the username or username and domain (as per Section 3.5 of RFC 5321). (Added in 7.34.0)

When performing a mailing list expand (EXPN command), the recipient should be specified using the mailing list name, such as "Friends" or "London-Office". (Added in 7.34.0)