Update highlights
This version replaces the previous SMTP validation feature with a new API validation system, which can interface with a variety of 3rd party email validation services. Please do be aware that these services are paid. Unfortunately, the old SMTP validation feature has been disabled by remote mail servers like Google and Yahoo.
Furthermore, a bug has been resolved in which enabling both the "max emails per hour" global setting AND disabling the per-mailing list "send instantly" function could cause the mail queue to grow out of control. To fix this in earlier versions, simply either disable max emails per hour or enable "Send instantly" in the mailing list.
Complete Change Log
Feature: Million Verifier API integration
Feature: Emailable API integration
Feature: MailboxLayer API integration
Feature: UseBouncer API integration
Feature: EmailListVerify API integration
Feature: CaptainVerify API integration
Feature: MyEmailVerifier API integration
Feature: ZeroBounce API integration
Feature: Reoon API integration
Feature: Bouncify API integration
Change: Removed SMTP Validation and replaced it with API
Fix: Fix a potential server error if the SNS notification did not contain a diagnostic code
Fix: Fix a race condition where the mail queue could fill up unexpectedly