Description:
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The following was placed at the top of a mailing list script, which logs into an account to check for messages, then repackages the message and sends it to the mailing list subscribers using the mail() function.

imap_timeout(IMAP_OPENTIMEOUT, 2);
imap_timeout(IMAP_READTIMEOUT, 2);
imap_timeout(IMAP_WRITETIMEOUT, 2);
imap_timeout(IMAP_CLOSETIMEOUT, 2);

Later in the script, I call imap_open(), specifically using connection to {localhost:993/ssl/no-validate-cert} if this makes a difference, unsure.

Periodically ran into an issue where the mail() call would simply stop returning true -- but for the directory the script is located in only.  I set up a second script, that simply tests the mail() function -- I place it in the directory where the locked-up script is located and mail() returns false.  Any other directory, mail() will return true.