I have been using "sendmail -bv emailaddress" to validate email
addresses (buried within my client validation program.)
On my SCO system that uses 8.11.3, the results are written to standard output.
On my Linux Mint system, the results are emailed to me.
8.11.3 is appears to be no longer available for download, does anyone
know which was the last release that output was directed to standard
output?
sendmail - Postfix to Sendmail compatibility interface
[…]
-bv Do not collect or deliver a message. Instead, send an email
report after verifying each recipient address. This is useful for
testing address rewriting and routing configurations.
This feature is available in Postfix version 2.1 and later.
Postfix is not installed, and sendmail is 8.15.4.
I did try installing the oldest (8.12.11) version on the sendmail.org website, but it failed to compile.
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