Hi, thank you for contacting JustAnswer.com. My name is***** will do my best to provide the right answer to your email question.
If it is 543, that means an intermediate server failure... try again in about 4 to 12 or 24 hours, I advise.
If it is a 453, that means there is no such email address. There is no remedy for that except to either contact the person or organization and get their new email address, or else to check the spelling and if it was spelled incorrectly, send it again to the correctly spelled email address.
If it is a 534, that means either you need to send a smaller attachment, or that the authentication level (e.g. if emailing from an old email program or older version of a web browser using webmail) is insufficient.
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