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Unable to verify account name or password. 501 EHLO requires valid address

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I have problems setting up my email account. I'm using the right password (not the one for the dashboard). I can receive all emails, but can't sent any. I have tried this: https://support.apple.com/mail-settings-lookup and this https://emailsetup.swisscom.ch/guide/. I get "

Unable to verify account name or password". Even though, I receive emails. No problems on my iphone. 

Here is what is logged in my mail log.

I use OSX 10.14 with standard mail app. 

 

WROTE Jun 09 22:38:11.575 [kCFStreamSocketSecurityLevelTLSv1_2] -- host:smtpauths.bluewin.ch -- port:465 -- socket:0x600002055920 -- thread:0x60000504ab40
EHLO *.iway.ch

READ Jun 09 22:38:11.582 [kCFStreamSocketSecurityLevelTLSv1_2] -- host:smtpauths.bluewin.ch -- port:465 -- socket:0x600002055920 -- thread:0x60000504ab40
501 EHLO requires valid address