| Retry delay for unreachable domains: | @ESMTPDELAY@ (default: 5 mins) | 
      
        | Connection timeout: | @ESMTPTIMEOUTCONNECT@ (default: 1 min) | 
      
        | EHLO/HELO timeout: | @ESMTPTIMEOUTHELO@ (default: 5 mins) | 
      
        | HELO identification: |  | 
      
        | Keep session alive after message the is sent: | @ESMTPTIMEOUTKEEPALIVE@ (default: 1 min) | 
      
        | Keep session busy by sending RSETs every: | @ESMTPTIMEOUTKEEPALIVEPING@ (default: 0-disable) | 
      
        | Timeout for the QUIT command: | @ESMTPTIMEOUTQUIT@ (default: 5 seconds) |