Problems with spam, SPF, PTR
If you are getting tons of spam return-messages (like Failure Notification or Mailer Daemon)...THIS IS SPOOF
Partial solution: Enable Default Address and set every catchall to :fail: no such address here. This will stop you from getting the bounce-backs, but the real problem is not solved.
Full solution: You need to create an SPF record. An SPF record is an entry added to the DNS zones for a domain. This record verifies that a user has permission to send mail from that domain. This is used to prevent spoofing for your domain. You may contact us to be sure you have a working SPF record.
If your outgoing email keeps arriving in Spam and Junk folders (like at Yahoo or Hotmail) instead of the Inbox...
You need a dedicated server and then create an SPF record and PTR record for your domain. These records improve your reputation with other mail providers.
Also Read
Is IMAP supported?
IMAP is enabled by default on the shared hosting server plans, there is no configuration required...