On 2019-05-10 4:21 a.m., Laura Atkins via mailop wrote:
You don’t need to separate your transactional and your marketing mail on different IPs because the filters aren’t using IPs as the unique mail identifier.
I would suggest that you 'might' have a point when it comes to the bigger players, but most of the rest of the world still relies heavily on IP reputation.
We would suggest that transactional email ALWAYS be from different IP(s) than your transactional email.. mixing transactional email with marketing, while on the surface might be attractive to those sending marketing through the same IP(s) to benefit from the favoured status transactional email usually receives, in the end it may affect your ability to deliver transactional email.
ALWAYS separating those two types should be a 'best practice' and of course naming the PTR's clearly to show which is transactional and which isn't will help ensure that your transactional mail always gets preferred treatment.
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