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Ohhh good point. So many sites basically only accept gmail + some other popular provider.

I‘m following this scheme for years now and frankly never found a site that only accepts selected providers.

AliExpress is one of them, as far as I know

AliExpress uses my custom domain, but wouldn't accept anything with "aliexpress" in the local part.

Correct, so I used "aliexpres" instead, which works.

A lot of asian genai startups are pretty picky and want emails from bigger providers. kling, qwen, hunyuan just to name a few.

Just create a gmail account specifically for it if that's the case.