Bug ID 471714: Certain SMTP servers (Windows) do not receive complete email due to missing CRLF header terminator in Emails generated by APM Email agent.

Last Modified: Sep 13, 2023

Affected Product(s):
BIG-IP APM(all modules)

Known Affected Versions:
11.5.1 HF1, 11.5.1 HF2, 11.5.1 HF3, 11.5.1 HF4, 11.5.1 HF5, 11.6.2 HF1, 11.3.0, 11.4.0, 11.4.1, 11.6.0, 11.6.1, 11.6.2, 11.6.3,,,,, 11.6.4, 11.6.5,,,, 12.1.0 HF1, 12.1.0 HF2, 12.1.1 HF1, 12.1.1 HF2, 12.1.2 HF1, 12.1.2 HF2

Fixed In:
12.0.0, 11.6.0 HF4, 11.5.1 HF6, 11.4.1 HF9

Opened: Jul 15, 2014

Severity: 3-Major

Related Article: K16637


Emails sent by the APM Email Agent when received by certain SMTP servers do not contain subject and body. This is caused by an incomplete header terminating character (LF) used in the Email Agent. CRLF needs to be used at the end of header and as a separator between the header and email body as per RFC 5322.


Email message with Empty body received by certain SMTP server.


Certain SMTP servers does not accept the LF terminator used in the Emails generated by APM Email agent.



Fix Information

The APM Email agent now generates emails using CRLF at the end of the header and as a separator between the header and the email body, conforming to RFC 5322.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips