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I am not sure I understand what relay means in this context. When the send is failing I am logged onto uninets.net. But, I am trying to use the SMTP at my webhost. The server name is my personal domain name at my webhost and I prefer not to post it.

I'm not sending to a mailing list. Only a single message at a time and always to the same addressee. I send very few messages -- maybe 15 a week.

Re: Which Service Is Denying Relaying? - relaying denied 550 5.7.1 If you mean change to uninets.net SMTP. I tried that originally and got authentication errors.

Re: Which Service Is Denying Relaying? - relaying denied 550 5.7.1 I no longer remember. I set this up a long time ago. This is a free utility and it has no provision for encryption or port change. It uses Port 25 and provides for SMTP server, Username, Password and email addresses --...

Re: Which Service Is Denying Relaying? - relaying denied 550 5.7.1 It works when sending from a Comcast connection. It is the other ISP it doesn't work on. If you are suggesting I use the Comcast SMTP, that doesn't work at all. That's why I am using my webhost.

Re: Which Service Is Denying Relaying? - relaying denied 550 5.7.1 Thanks for your reply. My home ISP is Comcast. The ISP where it fails is a small local outfit called uninets.net. The target SMTP outfit is my webhost. So, if it's my webhost why, since it's the same server, does it work...

I have a utility that sends email. It works properly when at home, but it gives a "relaying denied 550 5.7.1" error at another location (another service/isp). In both cases I am using the same SMTP and it's not the service I am logged onto in either case. It the service I'm logged onto...