If the alarm email fails because of a connection issue of some kind, the MASMonitorService should retry to send the email sometime later.
In a MAS trace log, the email notify thread, 14452, fails because of a connection issue:
DEBUG 2026-06-16 16:38:03.600 3744 14452 Executing alarm actions for rule [Email Notify] of task set [<Task set name>]
TRACE 2026-06-16 16:38:03.600 3744 14452 Enter CreateXMLAlarmReport
DEBUG 2026-06-16 16:38:03.600 3744 14452 Creating XML alarm report for task set [<Task set name>]
DEBUG 2026-06-16 16:38:03.631 3744 14452 XML alarm report created for task set [<Task set name>]
TRACE 2026-06-16 16:38:03.631 3744 14452 Exit CreateXMLAlarmReport
TRACE 2026-06-16 16:38:03.631 3744 14452 Enter XSLTransform
TRACE 2026-06-16 16:38:03.631 3744 14452 Exit XSLTransform
ERROR 2026-06-16 16:38:03.766 3744 14452 Exception detected in CTaskSetInfo::ProcessRulesAndActions. HRESULT = 0x80131500 Description = [#4.4.5 Too many connections to this listener.]