iyzsong@outlook.com schreef op za 12-03-2022 om 10:22 [+0800]:
> +   "If set, specifies the outgoing SMTP server to
> +use (e.g. @code{smtp.example.com} or a raw IP address).

How does smtp.example.com specify the SMTP server?  As a DNS address?

Does that mean I can do

  (sendemail.smtpServer
    (make-socket-address AF_INET INADDR_LOOPBACK some-number ...))?

'make-socket-address' is Guile's procedure for making an address,
'AF_INET' indicates IP is used, INADDR_LOOPBACK some-number indicates
which IP address ...

Also, wouldn't a raw IP address be a 32-bit integer? (or 128-bit in
case of IPv6)?  And in case of IPv6, is this with or without
surrounding [brackets]?  Perhaps a reference to the relevant Internet
RFC would be useful.

Greetings,
Maxime.