MTA
1. Receives mail from client
2. forward mail between servers using SMTP
MDA
1. Resolves final delivery issues
2. performs actual delivery to user's mailbox
MUA
1.Client used to access and to read mail
2. retrieves mail using POP
1. Receives mail from client
2. forward mail between servers using SMTP
MDA
1. Resolves final delivery issues
2. performs actual delivery to user's mailbox
MUA
1.Client used to access and to read mail
2. retrieves mail using POP
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