For a long time now I’ve had my Exchange server configured to use smtp.xtra.co.nz as a "Smart Host". It has always worked well with no problems.
In the last few days however I've been having customers claim they've not been receiving my e-mails even though they have left my server. Some people I've tried to e-mail have bounced with a #550 Invalid recipient error. Some just receive nothing and I get no NDR at all.
Today, I changed my Exchange configuration to route e-mail thru DNS rather than thru smtp.xtra.co.nz and my e-mail now works correctly. One customer who received nothing from me, is now getting my e-mail.
I have several of my customers Exchange servers configured to use smtp.xtra.co.nz as well so over the weekend I’ll be changing a couple of them to see if the odd errors they’ve been reporting this week disappear.
Does anyone know if Telecom have recently changed anything that might cause this? I’ll post back after testing this a bit more.
Our company has received a large number of NDR recently.. namely from xtra.co.nz addresses. Retransmission always reduces this figure.. Our IT guys have said that xtra.. owned by Yahoo, have had their servers unavailable intermittently for some reason.. The system is configured to resend an email up to 5 times if unsuccessful. If unsuccessful on the 5th attempt, we get the NDR. One recent transmission of 2000+ emails.. resulted in 200 NDRs.. 4 were for the usual reasons, mispelt address.. however 196 were xtra.co.nz. Retransmits of these 196 NDR resulted in just 9 NDR.. what we would normally expect..
There has definitely been something changed at Telecom/Yahoo. We've doing this for years and started to get these issues only in the last month..
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