If it is false, sendmail bounces the mail message with the
following error message:
MX list for otherhost points back to thishost
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24.9 Alphabetized Options | 1113
If bool is true, sendmail looks to see whether the receiving host has an A or AAAA record. If
it does, sendmail tries to deliver the mail message directly to that host??™s A or AAAA record
address. If the host doesn??™t have an A or AAAA record, sendmail bounces the message. See
?§9.3.8 on page 337 for a full discussion of why one setting might be preferable over another.
Note that RFC2821 requires that this option be set to false to prevent it from creating unpredictable
mail routing. The default with the mc configuration technique is false.
The TryNullMXList option is not safe as of V8.8.4. If it is specified from the command line,
it can cause sendmail to relinquish its special privileges.
24.9.124 UnixFromLine
Define the From format All versions
The UnixFromLine option replaces the pre-V8.7 $l macro. It has two functions:
??? It defines the look of the five-character ???From ??? header line needed by UUCP software.
??? It defines the format of the line that is used to separate one message from another in a
file of many mail messages.
The forms of the UnixFromLine option and $l macro are as follows:
Dlformat ?†? configuration file (V8.
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