2 or more bounces in a single message

Sisimai can detect all recipient addresses and error reasons from a single message which include 2 or more bounce records, such as those listed below. bounceHammer can only detect the first one.

Content-Type: message/delivery-status

Reporting-MTA: dns; nijo.example.jp
Received-From-MTA: DNS; smtp-gateway.kyoto.ocn.ne.jp
Arrival-Date: Wed, 26 Feb 2014 06:05:47 -0500

Final-Recipient: RFC822; userunknown@example.org
Action: failed
Status: 5.1.1
Remote-MTA: DNS; mx.example.org
Diagnostic-Code: SMTP; 550 5.1.1 ... User Unknown
Last-Attempt-Date: Wed, 26 Feb 2014 06:05:48 -0500

Final-Recipient: RFC822; filtered@example.com
Action: failed
Status: 5.2.1
Remote-MTA: DNS; mx.example.com
Diagnostic-Code: SMTP; 550 5.2.1 ... User Unknown
Last-Attempt-Date: Wed, 26 Feb 2014 06:05:48 -0500

--s1QB5ma0018057.1393412748/nijo.example.jp
Content-Type: message/rfc822
                

Bounce mails in Gmail mailbox

Sisimai can also decode bounce emails in your Gmail mailbox. bounceHammer can also decode bounce emails in your Gmail mailbox if they are in an older format, but it cannot decode bounce emails in the current format.

Status: 2.X.X

Sisimai can correctly decode bounce emails (e.g., rfc3464-28.eml ) that contain lines like Status: 2.1.5 and determine the bounce reason as "delivered". However, bounceHammer can also decode such emails, but it determines the bounce reason as "undefined", as shown in the output example below.

  {
    "token": "0ac0d79df3cc8ef4fc606334af840330",
    "description": {
      "timezoneoffset": "+0900",
      "subject": "Nyaaan",
      "smtpagent": "",
      "messageid": "<20151025071802.22CC00222233@neko-222-2222.vs.example.ne.jp>",
      "listid": "",
      "diagnosticcode": "smtp; 250 2.1.5 Ok",
      "deliverystatus": "2.1.5"
    },
    "frequency": 1,
    "bounced": 1430318085,
    "addresser": "root@neko-222-2222.vs.example.ne.jp",
    "recipient": "kijitora@neko.example.jp",
    "senderdomain": "neko-222-2222.vs.example.ne.jp",
    "destination": "neko.example.jp",
    "reason": "undefined",
    "hostgroup": "reserved",
    "provider": "reserved"
  },
                

Feedback Loop message

Sisimai can also decode emails in the ARF (Abuse Reporting Format) format, which is used by overseas email services such as AOL and Yahoo!. bounceHammer's FBL support is only an experimental implementation and cannot fully decode emails in the ARF format.

High Precision of Analysis

Sisimai has 73 built-in MTA/ESP decoding modules, giving it about twice the analysis accuracy of bounceHammer. Sisimai can also decode bounce emails from commercial MTAs such as Microsoft Exchange Server and IBM Notes and Domino, as well as commercial email services such as Amazon SES, WorkMail, and SendGrid.

Faster than bounceHammer

The Perl version of Sisimai decode emails and generates structured data about 2.0 times faster than the bounceHammer bin/mailboxparser command.

Small and Robust

Sisimai is a library that specializes in decoding bounce emails, and therefore it is designed to be small and robust, as follows:

• About half the number of lines of source code as bounceHammer
• About five times the number of tests as bounceHammer
• Only two dependent modules