We have upgraded the antispam filters on all mail servers to reduce the reception of mail bombs. This step is aimed at further increasing the stability of our mail servers.
Never heard of a mail bomb? A mail bomb aims to completely fill the disks of a mail server and exists in two forms, which can also be applied simultaneously:
- Sending a large number of emails with the maximum allowed attachment size.
- Sending even a single email with an attachment packed into an archive. If the attacker uses a file with high compression potential, a 9 MB file can expand to an astonishing 4 GB. Every antivirus must unpack the attachment, check it, mark the email as safe, and reinsert it into the delivery queue. Repeating this process involves a significant amount of data.
By implementing these changes, we strive to ensure greater reliability and performance for your email services.