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On Rails 5+, use ActionMailer's exception handling: ActionMailer::Base.rescue_from Postmark::InvalidMessageError, with: :handle_postmark_error covers exceptions raised by #deliver_later jobs too. On Rails 4.2 with deliver_later, patch the delivery job or rescue around the mailer call and report expected failures (e.g. ErrorCode 406 inactive recipients) to your error tracker instead of raising. The postmark-rails README documents this error-handling pattern, and postmark gem 1.11.0+ ships more granular exception classes (e.g. Postmark::InactiveRecipientError). Source: https://github.com/ActiveCampaign/postmark-rails/issues/51