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Best way to track down problems with mailing list newsletter

By Smich54018 ·
Hi,

I'm responsible for an opt-in mailing-list/newsletter that my company uses to advertise new products and the like- nothing spectacular.

To cut a long story short, we had to switch from using our ISP's mail server to using our own and since then have had more problems with it not always getting through.

However, it's not clear where the problem is. Some seem to be rejected immediately, others come back with rejection messages from our server like

"Unable to deliver message to the following recipients, due to being unable to connect successfully to the destination mail server"

But this doesn't tell us much(?)

Where and how is the best place to learn how to track down such problems?

Thanks,

- Smich

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