The message is downloaded when the client connects to the POP3 or IMAP mail server.Found malicious artifacts related to "98.137.201.117" (ASN: 26101, Owner: Yahoo!). ![]() After the message is received by the remote SMTP host it is sent to the POP3 or IMAP mail server which contains the mailbox of the intended recipient.If a connection can be established with the remote SMTP host and the remote SMTP host accepts the connection, the SMTP service transfers the message to the remote SMTP host.The message is placed in the Badmail folder if it cannot be returned to the sender. If a connection can be established with the remote SMTP host but the connection is rejected by the remote SMTP host, the SMTP service forwards the sender of the message a non-delivery report (NDR), and returns the message as well.If a connection cannot be established with the remote SMTP host, the SMTP service places the message in the Queue folder.Port 25 is utilized for the message transfer. After the fully qualified domain name (FQDN) of the remote SMTP host is determined, the SMTP service attempts to create a connection with the remote SMTP host to transfer the message for the recipient to it.The SMTP service checks for the MX record for the remote domain. The port used for this process is port 53. The SMTP service then performs a DNS lookup on the name server so that it can find the SMTP host that manages the remote domain.This is done through the ASP application using CDOSYS. If a message has to be sent to a user that is a member of a different or remote domain, an ASP application has to create and place the outgoing message in the Pickup folder.SMTP places messages for users that are members of the local domain it manages in the Drop folder for delivery.It monitors the Pickup folder for all outgoing messages.Smtpsvc.dll monitors TCP port 25 for any incoming messages. ![]()
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