forward files to be displayed. If needvrfyhelo is specified, sendmail
requires that the requesting site first introduce itself with an SMTP HELO or EHLO command.
If the requesting site has not done so, sendmail responds withth e same message as for
needexpnhelo, rather than providing the requested verification information.
24.9.86.8 PrivacyOptions=noactualrecipient
DSN bounce messages generally display the intended recipient??™s name on the X-Actual-
Recipient line. For privacy reasons, you may prefer to protect the identity of your
recipients, and if so, you should set this PrivacyOptions setting to noactualrecipient.
24.9.86.9 PrivacyOptions=noexpn
Setting noexpn causes sendmail to disallow all SMTP EXPN commands. In place of information,
sendmail sends the following reply to the requesting host:
502 That's none of your business ?†? prior to V8.7
502 Sorry, we do not allow this operation ?†? beginning with V8.7
* Th echeck_etrn rule set can do much more than this too.
This is the Title of the Book, eMatter Edition
Copyright ?© 2007 O??™Reilly & Associates, Inc. All rights reserved.
1068 | Chapter 24: The O (Options) Configuration Command
Setting noexpn also causes sendmail to reject all SMTP VERB commands:
502 5.0.0 Verbose unavailable
Other sendmail programs might send VERB if the delivery agent making the connection has
the F=I flag set (see ?§20.
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