To prevent the abuse of our service by spammers, we limit how many mails our customers can send out per hour and per day. The default limits we impose are more than enough for most regular email users, but nowhere near enough to be of any use to spammers. Because of this, it's very unlikely that one of our customers would be sending you spam.

What's much more likely is that the headers of the mail you received have been forged to make it look like the message came from a Neomailbox account. But if you look closely at the complete headers of the mail, you will notice that the mail did not originate from or pass through our servers.

If you receive any spam that appears to be from a Neomailbox account, please do forward it to us (with complete headers intact). We may be able to glean some information about the real spammers from such messages.

It's trivially easy to forge a "From:" or "Reply-To:" header, as most email programs allow users to specify these headers themselves. The ability to specify any "From:" header can be quite useful, enabling you to, for example, use our secure SMTP server to send mail with the From: address set to your home or work email address.

Other headers that are harder to forge are the "Received:" headers. While these can be quite misleading as well, they are still normally quite useful in identifying the real source of an email message.

Using our IMAP based webmail system, you can delete big emails from your mailbox to ensure your POP3 mail client doesn't try to fetch such mails. You could also move them to a new IMAP folder using the webmail system, which will also prevent them from being downloaded by your email program.

Many email programs also allow you to set the maximum attachment size to download when retrieving messages using POP3. With a reasonable limit set for this parameter, you should be able to avoid downloading large attachments.