How do you rebuild trust with Gmail and Microsoft specifically?

Provider-specific trust rebuilding:

Gmail:

Focus on engagement (opens, clicks, replies)

Send to users who have engaged recently

Quality over quantity

Monitor Postmaster Tools closely

Gmail's ML learns from user behavior

Microsoft:

Reduce complaint-generating sends

Clean list of addresses generating issues

Monitor SNDS for IP reputation

May respond to direct outreach in severe cases

Both providers:

Consistent, predictable sending patterns

Strong authentication always

Gradual volume increases

Patience over weeks

Different port authorities value different things. Tailor your approach to each.