263 mail server
A mail server!
A mail server is a computer that handles email messages and provides services for sending, receiving, and storing email. Here are some common types of mail servers:
- SMTP (Simple Mail Transfer Protocol) server: responsible for sending and receiving email messages between mail servers.
- POP3 (Post Office Protocol version 3) server: allows email clients to retrieve email messages from the mail server.
- IMAP (Internet Message Access Protocol) server: allows email clients to access and manage email messages on the mail server.
- Mail Transfer Agent (MTA): responsible for transferring email messages between mail servers.
- Mail Delivery Agent (MDA): responsible for delivering email messages to the recipient's mailbox.
Some popular mail server software includes:
- Postfix: a popular open-source MTA.
- Sendmail: a widely used open-source MTA.
- Exim: a popular open-source MTA.
- Microsoft Exchange: a commercial email server software.
- Zimbra: a commercial email server software.
Mail servers can be configured to provide various features, such as:
- Spam filtering: to block unwanted email messages.
- Virus scanning: to detect and remove malware from email messages.
- Authentication: to verify the identity of email senders and recipients.
- Encryption: to protect email messages in transit.
- Backup and archiving: to store email messages for later retrieval.
In your case, the mail server with the IP address 263 is likely a mail server that is part of a larger email infrastructure, such as a company's internal email system or a cloud-based email service.