php - Is there a tool that can tell a domain's IMAP or POP3 address? -

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i'm building web email client , i'm interested in easy ways figure out imap or pop3 emails. there tool figure out?

i'm assuming if not, best bet 

try { imap.domain.com }  catch{          try { mail.domain.com }          catch { ...etc ... } }

there no way. best bet try domain of e-mail, plus usual prefixes, suggest. then, imap server may running in non-standard port; have no way of knowing.


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