$smtp_transaction_id_patterns = ['exim' => '/[\d]{3} OK id=(.*)/', 'sendmail' => '/[\d]{3} 2\.0\.0 (.*) Message/', 'postfix' => '/[\d]{3} 2\.0\.0 Ok: queued as (.*)/', 'Microsoft_ESMTP' => '/[0-9]{3} 2\.[\d]\.0 (.*)@(?:.*) Queued mail for delivery/', 'Amazon_SES' => '/[\d]{3} Ok (.*)/', 'SendGrid' => '/[\d]{3} Ok: queued as (.*)/', 'CampaignMonitor' => '/[\d]{3} 2\.0\.0 OK:([a-zA-Z\d]{48})/', 'Haraka' => '/[\d]{3} Message Queued \((.*)\)/', 'ZoneMTA' => '/[\d]{3} Message queued as (.*)/', 'Mailjet' => '/[\d]{3} OK queued as (.*)/', ]

Issues