FreeBSD Handbook's chapter "Electronic Mail" has section "SMTP Authentication" that dates back the times FreeBSD had not any OpenSSL version in base system. Now since we have different OpenSSL versions in different supported branches (1.0.2 for stable/11 and 1.1.1+ for stable/12) that differ in API and ABI, this section needs small correction because it's broken for stable/11 for the moment. It's paragraph 4 suggests: Next, edit /etc/make.conf and add the following lines: SENDMAIL_CFLAGS=-I/usr/local/include/sasl -DSASL SENDMAIL_LDFLAGS=-L/usr/local/lib SENDMAIL_LDADD=-lsasl2 The line "SENDMAIL_LDFLAGS=-L/usr/local/lib" should be replaced with another one: SENDMAIL_LDADD=/usr/local/lib/libsasl2.so That's because the only port's library our stock sendmail needs is really libsasl2.so. With -L/usr/local/lib buildworld process links sendmail with ports version of libcrypto what is wrong for stable/11 which needs base system version of libcrypto. The problem's solved with noted one-line change. I'd like to see this change performed before 11.4-RELEASE coming soon.
Small correction: both current "SENDMAIL_LDFLAGS=-L/usr/local/lib" and "SENDMAIL_LDADD=-lsasl2" should be replaced with single line: SENDMAIL_LDADD=/usr/local/lib/libsasl2.so
A commit references this bug: Author: bcr Date: Sat May 9 10:34:28 UTC 2020 New revision: 54123 URL: https://svnweb.freebsd.org/changeset/doc/54123 Log: Update the /etc/make.conf entries regarding sendmail. The instructions in the handbook were from a time when we did not have any OpenSSL version in the base system. Nowadays, with different versions of OpenSSL in various FreeBSD branches that differ in API/ABI, these small corrections are needed because they would be broken for stable/11 otherwise. Thanks to Eugen Grosbein for pointing this out and providing the lines for /etc/make.conf. PR: 244937 Submitted by: eugen@ Changes: head/en_US.ISO8859-1/books/handbook/mail/chapter.xml
I committed a change in time before 11.4-RELEASE. Thank you, Eugene.
*** Bug 243357 has been marked as a duplicate of this bug. ***
*** Bug 175052 has been marked as a duplicate of this bug. ***
FYI: I just hit this bug, and the online handbook does not have the corrected information: https://docs.freebsd.org/doc/11.4-RELEASE/usr/local/share/doc/freebsd/en_US.ISO8859-1/books/handbook/SMTP-Auth.html But indeed, applying the change described does fix the issue for me too (: