If you are experiencing perceived delays receiving emails, it may be related to "greylisting". Greylisting is the technique of denying mail delivery the first time a sender tries to deliver to a recipient if they have never emailed you in the last 30 days. The next time the remote server attempts to deliver the message, it is accepted. All future messages from the sender to the recipient are also allowed. With Greylisting enabled, our mail server will "temporarily reject" any email from a sender it does not recognize. The originating server will try a new delivery, usually in a few minutes, and if the mail is legitimate, it will be accepted. If the mail is from a spammer it will probably not be retried, as spammers go through thousands of email addresses and cannot afford the time delay to retry a particular message. Standard mail servers, however, always attempt to deliver messages again if they are rejected with such a “temporary” error message, in accordance with the SMTP RFC specifications.
Switching off greylisting is an option but we highly recommend not doing so as it could result in a significant increase in unsolicited mail.
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