Add a new variable smtpmail-retries

* doc/misc/smtpmail.texi (Server workarounds): Mention it (bug#34177).

* lisp/mail/smtpmail.el (smtpmail-retries): New variable.
(smtpmail-via-smtp): Use it.

1 files changed, 7 insertions, 0 deletions

diff --git a/doc/misc/smtpmail.texi b/doc/misc/smtpmail.texi
index b2fc90a337a..7fa7b24e162 100644
--- a/doc/misc/smtpmail.texi
+++ b/doc/misc/smtpmail.texi
@@ -372,6 +372,13 @@ implement support for common requirements.
 
 @table @code
 
+@item smtpmail-retries
+@vindex smtpmail-retries
+An SMTP server may return an error code saying that there's a
+transient error (a @samp{4xx} code).  In that case, smtpmail will try
+to resend the message automatically, and the number of times it tries
+before giving up is determined by this variable, which defaults to 10.
+
 @item smtpmail-local-domain
 @vindex smtpmail-local-domain
   The variable @code{smtpmail-local-domain} controls the hostname sent