why?
not my own server/config
Can you explain how each of these is better than the Postfix defaults?
all but two _are_ at defaults
postconf -n | grep -i tls | grep -i cipher | sort
@D smtpd_tls_ciphers = medium
@D smtpd_tls_exclude_ciphers =
@D smtpd_tls_mandatory_ciphers = medium
@D smtp_tls_ciphers = medium
! smtp_tls_exclude_ciphers = EXP, LOW, MEDIUM, aNULL, eNULL, SRP,
PSK, kDH, DH, kRSA, DHE, DSS, RC4, DES, IDEA, SEED, ARIA, CAMELLIA, AESCCM8,
3DES, ECDHE-ECDSA-AES256-SHA384, ECDHE-ECDSA-AES128-SHA256,
ECDHE-RSA-AES256-SHA384, ECDHE-RSA-AES128-SHA256, MD5, SHA
@D smtp_tls_mandatory_ciphers = medium
! tls_preempt_cipherlist = yes
@D tlsproxy_tls_mandatory_exclude_ciphers =
$smtpd_tls_mandatory_exclude_ciphers
postconf -d smtp_tls_ciphers smtp_tls_exclude_ciphers
smtp_tls_mandatory_ciphers smtpd_tls_ciphers smtpd_tls_exclude_ciphers
smtpd_tls_mandatory_ciphers tls_preempt_cipherlist
tlsproxy_tls_mandatory_exclude_ciphers | sort
smtpd_tls_ciphers = medium
smtpd_tls_exclude_ciphers =
smtpd_tls_mandatory_ciphers = medium
smtp_tls_ciphers = medium
smtp_tls_exclude_ciphers =
smtp_tls_mandatory_ciphers = medium
tls_preempt_cipherlist = no
tlsproxy_tls_mandatory_exclude_ciphers =
$smtpd_tls_mandatory_exclude_ciphers
smtp_tls_exclude_ciphers is client-side, not server-side
(smtpd_tls_exclude_ciphers) , and as i understand it shouldn't be involved in
the smtp*d* inbound transaction.
or is it?
in any case, mod'ing
postconf -n smtp_tls_mandatory_ciphers tls_preempt_cipherlist
smtp_tls_mandatory_ciphers = medium
tls_preempt_cipherlist = no
has no effect, and results in the same errors from the *.iphmx.com sender in my
OP
I expect that Viktor will respond with a detailed coherent explanation
i'll look forward to it as always
there was some RC4 usage from ironport awhile ago,
https://community.cisco.com/t5/email-security/no-tls-for-ironport-cloud/td-p/2467698
unclear if/how it was resolved.
what specific postfix logging, if any, will ID what cipher is being
attempted/used ?
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