at first you don't succeed, try, try again. Then give up.
There's no use in being a damn fool about it.
- W.C. Fields,
early 20'th century actor.
SMTP servers will do their best to deliver delayed
email over the Internet, and will generally keep trying for several days. For
example, occasionally you will receive an email with a subject something like
Warning: message 129iHc-0007Z0-00 delayed 24 hours
The message body will also often say that the email you sent hasn't
been able to be delivered, and usually that the system will keep trying. Usually
the email server at the addressee's end is temporarily off-line for maintenance
or because of some termporary system problem.
You can safely ignore these sorts of messages, and your email will usually
be sent through when the problem is fixed. However, if you receive another
email that says that your server has given up trying, then you should check
by telephone to see if their email address has
changed or if their system is having other problems.