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Also did this
/etc/imapd.conf
tls_cipher_list: kEECDH:+kEECDH+SHA:kEDH:+kEDH+SHA:+kEDH+CAMELLIA:kECDH:+kECDH+SHA:kRSA:+kRSA+SHA:+kRSA+CAMELLIA:!aNULL:!eNULL:!SSLv2:!RC4:!MD5:!DES:!EXP:!SEED:!IDEA:!3DES
tls_prefer_server_ciphers: 1
tls_versions: tls1_0 tls1_1 tls1_2
Based on this
https://access.redhat.com/articles/1470873 -