Google Postmaster Tools alternatives

10 other deliverability listed here. Google Postmaster Tools is free.

Warmup, placement tests and DNS checks

Inbox placement testing with seed lists

Warmup using a network of real accounts

Scores a test email out of 10

Mailbox infrastructure for cold email

Email warmup and spam testing

DNS, blacklist and mail server diagnostics

Bulk and real-time email verification

Warmup that ramps volume and tests placement

Email verification and list cleaning