Can someone recommend some mail service providers?

I used two email accounts to log in yesterday, but today, my accounts are locked. so , somebody can recommend some email service provider for DetalChat.

depends on what is important to you, generally paid providers are better IMHO.

https://providers.delta.chat/ is the community maintained list of what providers work and what steps are needed to get them to work, you should look for providers that have the status “OK”, but that list does not say anything about quality, just if they work or not.

We recently did a small test with some providers where we compared performance:

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I tested DC with T-Online/Magenta, iCloud-Mail, GMX, Web.de and Gmail.
There were no problems.

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Thank you very much!