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Receiving Errors From Mimecast

https://forum.efa-project.org/viewtopic.php?t=4399

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Receiving Errors From Mimecast

Posted: 21 Jul 2020 22:29
by cbritton1978
Okay I can't figure this out. I noticed in my mail logs when I get emails from domains using mimecast I receive errors like below.
Jul 21 17:32:37 efa postfix/smtpd[6942]: connect from us-smtp-delivery-166.mimecast.com[216.205.24.166]
Jul 21 17:32:37 efa postfix/smtpd[7099]: connect from us-smtp-delivery-166.mimecast.com[216.205.24.166]
Jul 21 17:32:38 efa postfix/smtpd[6942]: SSL_accept error from us-smtp-delivery-166.mimecast.com[216.205.24.166]: 0
Jul 21 17:32:38 efa postfix/smtpd[6942]: warning: TLS library problem: error:14094416:SSL routines:ssl3_read_bytes:sslv3 alert certificate unknown:s3_pkt.c:1493:SSL alert number 46:
Jul 21 17:32:38 efa postfix/smtpd[6942]: lost connection after STARTTLS from us-smtp-delivery-166.mimecast.com[216.205.24.166]
Jul 21 17:32:38 efa postfix/smtpd[6942]: disconnect from us-smtp-delivery-166.mimecast.com[216.205.24.166] ehlo=1 starttls=0/1 commands=1/2
Jul 21 17:32:38 efa postfix/smtpd[7099]: SSL_accept error from us-smtp-delivery-166.mimecast.com[216.205.24.166]: 0
Jul 21 17:32:38 efa postfix/smtpd[7099]: warning: TLS library problem: error:14094416:SSL routines:ssl3_read_bytes:sslv3 alert certificate unknown:s3_pkt.c:1493:SSL alert number 46:
Jul 21 17:32:38 efa postfix/smtpd[7099]: lost connection after STARTTLS from us-smtp-delivery-166.mimecast.com[216.205.24.166]
Jul 21 17:32:38 efa postfix/smtpd[7099]: disconnect from us-smtp-delivery-166.mimecast.com[216.205.24.166] ehlo=1 starttls=0/1 commands=1/2
Jul 21 17:32:38 efa postfix/smtpd[6942]: connect from us-smtp-delivery-166.mimecast.com[216.205.24.166]
Jul 21 17:32:38 efa postfix/smtpd[7099]: connect from us-smtp-delivery-166.mimecast.com[216.205.24.166]
Jul 21 17:32:38 efa postfix/smtpd[7099]: 4BBBdf5XjczGsXV8: client=us-smtp-delivery-166.mimecast.com[216.205.24.166]
Jul 21 17:32:38 efa postfix/smtpd[6942]: 4BBBdf5bMQzGsrYQ: client=us-smtp-delivery-166.mimecast.com[216.205.24.166]
Jul 21 17:32:39 efa postfix/cleanup[7106]: 4BBBdf5XjczGsXV8: message-id=<DM5PR0501MB3848135E666D960C12000407B5780@DM5PR0501MB3848.namprd05.prod.outlook.com>
Jul 21 17:32:39 efa postfix/cleanup[7107]: 4BBBdf5bMQzGsrYQ: message-id=<DM5PR0501MB3848135E666D960C12000407B5780@DM5PR0501MB3848.namprd05.prod.outlook.com>
Jul 21 17:32:40 efa postfix/smtpd[6942]: lost connection after DATA (390283 bytes) from us-smtp-delivery-166.mimecast.com[216.205.24.166]
Jul 21 17:32:40 efa postfix/smtpd[6942]: disconnect from us-smtp-delivery-166.mimecast.com[216.205.24.166] ehlo=1 mail=1 rcpt=1 data=0/1 commands=3/4
Jul 21 17:32:40 efa postfix/smtpd[6942]: connect from us-smtp-delivery-166.mimecast.com[216.205.24.166]
Jul 21 17:32:40 efa postfix/smtpd[7099]: lost connection after DATA (390283 bytes) from us-smtp-delivery-166.mimecast.com[216.205.24.166]
Jul 21 17:32:40 efa postfix/smtpd[7099]: disconnect from us-smtp-delivery-166.mimecast.com[216.205.24.166] ehlo=1 mail=1 rcpt=1 data=0/1 commands=3/4
Jul 21 17:32:40 efa postfix/smtpd[7099]: connect from us-smtp-delivery-166.mimecast.com[216.205.24.166]
Jul 21 17:32:40 efa postfix/smtpd[6942]: SSL_accept error from us-smtp-delivery-166.mimecast.com[216.205.24.166]: 0
Jul 21 17:32:40 efa postfix/smtpd[6942]: warning: TLS library problem: error:14094416:SSL routines:ssl3_read_bytes:sslv3 alert certificate unknown:s3_pkt.c:1493:SSL alert number 46:
Jul 21 17:32:40 efa postfix/smtpd[6942]: lost connection after STARTTLS from us-smtp-delivery-166.mimecast.com[216.205.24.166]
Jul 21 17:32:40 efa postfix/smtpd[6942]: disconnect from us-smtp-delivery-166.mimecast.com[216.205.24.166] ehlo=1 starttls=0/1 commands=1/2
Jul 21 17:32:40 efa postfix/smtpd[6942]: connect from us-smtp-delivery-166.mimecast.com[216.205.24.166]
Jul 21 17:32:40 efa postfix/smtpd[7099]: SSL_accept error from us-smtp-delivery-166.mimecast.com[216.205.24.166]: 0
Jul 21 17:32:40 efa postfix/smtpd[7099]: warning: TLS library problem: error:14094416:SSL routines:ssl3_read_bytes:sslv3 alert certificate unknown:s3_pkt.c:1493:SSL alert number 46:
Jul 21 17:32:40 efa postfix/smtpd[7099]: lost connection after STARTTLS from us-smtp-delivery-166.mimecast.com[216.205.24.166]
Jul 21 17:32:40 efa postfix/smtpd[7099]: disconnect from us-smtp-delivery-166.mimecast.com[216.205.24.166] ehlo=1 starttls=0/1 commands=1/2
Jul 21 17:32:40 efa postfix/smtpd[7099]: connect from us-smtp-delivery-166.mimecast.com[216.205.24.166]
Jul 21 17:32:40 efa postfix/smtpd[6942]: 4BBBdh64VtzGsXV8: client=us-smtp-delivery-166.mimecast.com[216.205.24.166]
Jul 21 17:32:40 efa postfix/smtpd[7099]: 4BBBdh70jZzGsrYQ: client=us-smtp-delivery-166.mimecast.com[216.205.24.166]
Jul 21 17:32:41 efa postfix/cleanup[7107]: 4BBBdh64VtzGsXV8: message-id=<DM5PR0501MB3848135E666D960C12000407B5780@DM5PR0501MB3848.namprd05.prod.outlook.com>
Jul 21 17:32:41 efa postfix/cleanup[7106]: 4BBBdh70jZzGsrYQ: message-id=<DM5PR0501MB3848135E666D960C12000407B5780@DM5PR0501MB3848.namprd05.prod.outlook.com>
Jul 21 17:32:42 efa postfix/smtpd[6942]: lost connection after DATA (391063 bytes) from us-smtp-delivery-166.mimecast.com[216.205.24.166]
Jul 21 17:32:42 efa postfix/smtpd[6942]: disconnect from us-smtp-delivery-166.mimecast.com[216.205.24.166] ehlo=1 mail=1 rcpt=1 data=0/1 commands=3/4
Jul 21 17:32:42 efa postfix/smtpd[7099]: lost connection after DATA (391453 bytes) from us-smtp-delivery-166.mimecast.com[216.205.24.166]
Jul 21 17:32:42 efa postfix/smtpd[7099]: disconnect from us-smtp-delivery-166.mimecast.com[216.205.24.166] ehlo=1 mail=1 rcpt=1 data=0/1 commands=3/
Is the error being caused by EFAs certificate or is it an encryption error? Any help would be appreciated.

Re: Receiving Errors From Mimecast

Posted: 22 Jul 2020 02:41
by cbritton1978
Nevermind I got it to work. I enabled Let's Encrypt

Then updated postfix main.cf

smtpd_tls_key_file = /etc/letsencrypt/live/my efa hostname/privkey.pem
smtpd_tls_cert_file = /etc/letsencrypt/live/my efa hostname/fullchain.pem
#smtpd_tls_CAfile = /etc/postfix/ssl/smtpd.pem

Hope this helps anyone else that has a similar problem.
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