I'm not sure in which RFC (or where else) to look this up. To my
understanding, a period is allowed in the middle of the local part of an
email address but it must be between two characters that are letters of the
alphabet or digits; it may not be the first character of the local part, nor
the last one before the at-sign, nor next to another period or any other
punctuation mark. Is that correct?
Thanks for any help.
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