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_I need help figuring out what a Delivery Status Notification (DSN) bounce message message is saying. Can you help me learn how to interpret these messages?_ E-mail is exchanged using a protocol called SMTP. The DSN or bounce message is a report base...
Following are some of the commonly seen SMTP return codes. 211 System status, or system help reply 214 Help message 220 Service ready 221 Service closing transmission channel 421 Service not available, 250 Requested mail action okay, completed 251 U...
Someone tried to send me a message and received "SMTP Error 553 5.1.8... Domain of sender address does not exist". What does this mean? In this situation, your mail server has refused the e-mail because it cannot identify the sender's domain (e.g. e...
_An e-mail I was expecting did was expecting a message and it did not arrive. When I checked the transmission log I saw "milter" errors saying "timeout before data read" and "to error state". What is going on? Is there a problem with my antispam server...
SUMMARY: Why am I getting a Command Unrecognized: "XXXXXXXX" error? ANSWER: Most likely a Cisco ASA is performing "inspect esmtp" or "inspect smtp" on incoming e-mail traffic. If the Cisco ASA finds an objectionable incoming SMTP command, it will re...
SUMMARY: What is Sender Policy Framework (SPF)? How does it work? How can I prevent SPF issues? ANSWER: Message Example: 550-5.1.1 SPF Block: YOUR DNS says [192.168.1.13] can't send mail(ID:l15I924U002784)) This sort of reject message occurs w...
SUMMARY: You are receiving errors from your mail client saying "can not read winmail.dat" or some similar error. You are *not* using a Microsoft e-mail client. ANSWER: winmail.dat is a proprietary Microsoft method of encrypting mail. This file is ge...
This error often occurs when custom scripts are created to send e-mail notifications, mail blasts, etc. The use of any separator character other than a comma ',' is not standards compliant. The Internet Message Format (RFC 2822 [1]) requires lists of e-ma...
E-mail deferral occurs when a message (usually outgoing) cannot be immediately handed off to the next relay host. It is quite common to have messages queued as "deferred" as remote mail servers may not be available for any number of reasons: network tr...
SUMMARY: Why is Google/GMail/Postini giving a 500 500 5.5.1 Command Unrecognized: "XXXXXXXX" error? ANSWER: Google/GMail/Postini returns a "Delivery Status Notification (Failure)" message with the following text: Delivery to the following recipient ...
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