Long: mail-rcpt
Arg: <address>
Help: Mail to this address
Protocols: SMTP
Added: 7.20.0
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Specify a single address, user name or mailing list name. Repeat this
option several times to send to multiple recipients.

When performing a mail transfer, the recipient should specify a valid email
address to send the mail to.

When performing an address verification (VRFY command), the recipient should be
specified as the user name or user name and domain (as per Section 3.5 of
RFC5321). (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)