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Why my banks tell me that their e-mails return? not vaild e-mail?

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Two of my banks are telling me that they were sending important e-mails to my e-mail and that were returned!? They asking me for valid e-mail address! That is happening since while ago...what is going on?

Two of my banks are telling me that they were sending important e-mails to my e-mail and that were returned!? They asking me for valid e-mail address! That is happening since while ago...what is going on?

Chosen solution

Only a server can refuse messages based on the email address being (in its opinion) invalid. The client you're using is, or should be, irrelevant.

Have you checked if these messages are available in your webmail?

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Chosen Solution

Only a server can refuse messages based on the email address being (in its opinion) invalid. The client you're using is, or should be, irrelevant.

Have you checked if these messages are available in your webmail?