Not if you use a smarthost to relay outgoing mail which is more or less a must on most IAPs since they block outgoing TCP/25 for domestic connections. Contact your IAP to find out which smarthost to use, many if not most offer this service. Assuming you have all the correct DNS magic configured as needed - DKIM, SPF et al - and assuming your IAP is not known for hosting spammers your mail should be ac
Source: experience in hosting my own mail since before the dawn of time, or at least since before the dawn of spam (and spamhaus).
Source: experience in hosting my own mail since before the dawn of time, or at least since before the dawn of spam (and spamhaus).