[chrisjj]

Given Fastmail is in many respects very good, iy is all more important to know that it has a severe deliverability problem wirh Gmail, in that a singificant number of messages autoforwarded by FM to Gmail are rejected - with no notification to the adressee. Support says this issue is not specific to Fastmail anc is expected to worsen.

My guess is the provider uou need is one having a high discouragement to spammers i.e. high cost. I have yet to find one that charges per sent message.