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I had the same problem when I upgraded to 2018.3, but found that all my previously created workflows with email functionality still worked. I had to put in the SMTP server settings once in a new workflow and after that it remembered it again. I only had to enter the SMTP server url - no ports and it worked.
I have not touched any of my previous connections however, none of my email tools work since I upgraded to 2018.3. I have tried manually entering in the SMTP several times with several different variations following the instructions in the provided link but keep getting errors. One error saying the "port number is not valid", I have used the default port (25), 587, 465 and 993, and another error saying "must issue STARTTLS command first".
I did not have an issue with this flow prior with the auto-detect feature.
I've had the same problem, and no combination of server and port settings seems to fix it. As described by others elsewhere in this thread, I have ended up re-using old workflows and replacing everything but the email tool. But that's hardly an ideal solution.
Alteryx, is there no way to reinstate auto-detect?
For those of you following this thread, as of the 2019.3 version of Alteryx Designer we have authentication functionality within the Email Tool. Users can now enter their credentials (username & password), select an encryption method, and connect to the appropriate port number.
If you are interested in connecting to a Gmail or other email service that was not previously supported by Alteryx Designer, please refer to the following knowledge base article to learn more on how to do so.