As of early March 2025 Digital Ocean has blocked Port 587.
I know Mailjet uses this port.
You can use Port 2525 as an alternative.
Took a lot of time to troubleshoot this as it has worked for years.
As the bowl of petunias said: “oh no, not again”. Feel free to re-use the lengthy explanation I gave in that topic in a vain attempt to beat some sense into DO.
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