I don't know what "exactly" with _ssl_ means for ceph - not knowledgeable to comment on the source code and user manuals do not go into those details or I failed to find such detailed info. What I could find does not mention TLS at all. As far as CEPH's configuration go, from user perspective:
-> $ ceph config set mgr mgr/alerts/smtp_ssl true
-> $ ceph config set mgr mgr/alerts/smtp_port 465
-> $ ceph alerts send

Postfix's log:
Sep 25 07:43:00 postfix/smtpd[1825935]: warning: run-time library vs. compile-time header version mismatch: OpenSSL 3.5.0 may not be compatible with OpenSSL 3.2.0 Sep 25 07:43:00 postfix/smtpd[1825935]: connect from unknown[10.1.1.61] Sep 25 07:43:00 postfix/smtpd[1825935]: improper command pipelining after CONNECT from unknown[10.1.1.61]: \026\003\001\002\000\001\000\001\374\003\003\237\251\001\377\312a\302\026\177x\271E\350\0238\005\016\334\324m\026w\0024\2472r;%\355^\206 \031\317\037\034\022\035@9\032g\351=\254\350lm\331d\177\262O\314F\200>\000\005z\253\336\364\a\000F\023\002\023\003\023\001\023\004\300,\3000\314\251\314\250\300\255\300+\300/ Sep 25 07:43:00 postfix/smtpd[1825935]: lost connection after CONNECT from unknown[10.1.1.61] Sep 25 07:43:00 postfix/smtpd[1825935]: disconnect from unknown[10.1.1.61] commands=0/0

and CEPH's
    [SSL: WRONG_VERSION_NUMBER] wrong version number (_ssl.c:1147)

-> $ ceph config set mgr mgr/alerts/smtp_port 587
-> $ ceph alerts send
Postfix's
...
Sep 25 07:43:49 postfix/submission/smtpd[1819876]: connect from unknown[10.1.1.61] Sep 25 07:43:49 postfix/submission/smtpd[1819876]: improper command pipelining after CONNECT from unknown[10.1.1.61]: \026\003\001\002\000\001\000\001\374\003\003\236\272\252-Z\017\025\200\325\336X\340V\265Jj\034\200\267\227K\253!\364\005\377l\232\225hP\031 ;\375\261\260\263\315\315\211)\300SK\210\2568\203(\303\336\246\343E\374)\307n\035\362\363m\b\b\000F\023\002\023\003\023\001\023\004\300,\3000\314\251\314\250\300\255\300+\300/ Sep 25 07:43:49 postfix/submission/smtpd[1819876]: lost connection after CONNECT from unknown[10.1.1.61] Sep 25 07:43:49 postfix/submission/smtpd[1819876]: disconnect from unknown[10.1.1.61] commands=0/0
Ceph's
...
    [SSL: WRONG_VERSION_NUMBER] wrong version number (_ssl.c:1147)
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