Synonyms of 'mail'
She looked through the mail.
2 postal service
Your cheque is in the mail.
You'll receive your book through the post.
He mailed me the contract.
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Someone's correspondence is the letters that they receive or send.
He always replied to his correspondence promptly.
Thesaurus for mail from the Collins English Thesaurus
The mail is the public service or system by which letters and parcels are collected and delivered.