Trying to send email via our Exchange server (which has been working fine for years), but now the external mail gets queued to go out, but dosent. Just sits there, message were seeing is "Remote connection dropped connection". If we force the emails, they go.
Ive Googled the issue and found people blame it on almost anything from DNS issues at the ISP to Symantec Mail Security causing it.
Weve checked with the ISP and via SMTP testing and found no fault at the ISP end, at our end weve disabled Symantec, restarted the Exchange services etc but still no go.
Any ideas what else we can check ?