If you are trying to send bulk mails with your server, Yahoo or Gmail servers reject mails after certain time.

What is Simple Mail Transfer Protocol (SMTP)?
SMTP stands for Simple Mail Transfer Protocol. It's a set of communication guidelines that allow software to transmit email over the Internet. Most email software is designed to use SMTP for communication purposes when sending email, and It only works for outgoing messages. When people set up their email programs, they will typically have to give the address of their Internet service provider's SMTP server for outgoing mail. There are two other protocols - POP3 and IMAP - that are used for retrieving and storing email.

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