Having a bit of an issue with a SPAM filter receiving incoming emails. I was recently notified by a client that emails had been bouncing back when trying to contact me following disabling RC4, SSLv2 & SSLv3.
The bounce back they've had is as follows.
Message delivery to 'firstname.lastname@example.org' delayed SMTP module(domain somedomain.com) reports: connection with mail.somedomain.com is broken
In past communications I can see the following in the message header.
version=TLS1_1 cipher=ECDHE-RSA-AES128-SHA bits=128/128
In speaking with our support network, I've been informed that by disabling SSLv3 it also disables TLS 1.0, and TLS 1.1 because they shared the same ciphers. Our client doesn't appear to be using TLS 1.2, and in prior communications I can see that they connect using TLS 1.1 which explains why their mail isn't getting through.
I can understand TLS 1.0 not being used, but I thought TLS 1.1 was still secure and wasn't aware that SSLv3 would have a direct impact on it?
Any help would be appreciated.