Mail Transfer Agent. It is responsible for transferring and routing an electronic mail message from the senders computer to the recipients computer. Mail transfer agents such as sendmail deliver mail between users and between systems.

Mail transfer agent strict transport security mta sts is a protocol which tells services that are sending your organisation email that your domain supports transport layer security tls 12 or. A mail transfer agent is software that sends email messages from one sender to the recipient. In addition providers like gmail and vtext have a variety of ways to detect and reject emails that are suspicious.
Mail user cant change its own forwarding in plesk.
It is also called a local delivery agent lda. Timeout for smtp traffic inspected by threat emulation. Threat emulation threat extraction and anti spam and mail security. It is also called a local delivery agent lda.