[Bug] Send failed (protocol error) on Ubuntu 22.04

[d99kris]

nmail version: 3.87

From ~/.nmail/log.txt:

2022-08-14 14:45:16.590 | WARN  | sender name [127.0.0.1]  (smtp.cpp:745)
2022-08-14 14:45:16.590 | ERROR | mailesmtp_ehlo_with_ip(smtp, useip) = MAILSMTP_ERROR_HOSTNAME  (smtp.cpp:131)

Likely introduced with commit ba2a192

[d99kris]

Standalone test on Ubuntu 22.04 indicates that getnameinfo() fails with errno = 11 in library libetpan.

Will proceed to change the default setting to send_hostname=1 until this is fixed in underlying library (perhaps libetpan or other).

[d99kris]

For reference, using send_hostname=0 works fine on macOS and Ubuntu 20.04.