Here's the scenario: I have two application A & B. A is used by Web Users where B is used internally. Some operations carried by the web users of A require sending emails immediately. the problem is that Application B sends mass emails every day at 3:00(500-2000) which affects those using A as far as their email confirmations are concerned.
I need some ideas to deal with this issue.
Looks like your SMTP server is getting more requests than it can handle. Think about increasing it's capacity - no. of cleint connections,sockets etc.
That is exactly what the problem is. I need to start thinking about how configure SendMail.
Set up of a separate mail server for the two applications. The web application in particular should be able to get away with a very simple mail server, such as the Open Source James server from the Apache group.