stop bad attachments

The “stop bad attachments” option blocks all potentially harmful attachments
except some safe extensions that you can define, like: pdf, txt, gif, jpg and png.

The sending with an unauthorized attachments is stopped.

The message does not pass through the smtp server,
the email gets bounced back to the sender with this warning:

The attachment named "example.zip" 
violates Your Company's email security policy. 

The delivery been been blocked. 
For more information, contact your IT Administrator.

limit messages number

Inspired by a comment from Phil Pennock on the SAGE mailing list:

I really wish that I'd be allowed to put a per-customer throttle on mails-per-day, 
raisable if a customer has legitimate reasons to be sending mail ...

High email volumes are often generated by a compromised account.
They can damage your company’s reputation and the one of your mailserver.

The “limit message number” option lets you define a maximum number of daily emails per sender,
so that any excess quantities will be blocked before going on the internet.

The sending of “extra quantity” communications are stopped.
The emails get bounced back immediately to the sender, with a warning like:

An error occurred when sending email. The mail server answered: 
450 4.7.1 <>...  sender@example.com has exceeded n messages per 1 day.

As an antispam measure, most smtp servers introduced an option to limit the number of recipients
that can be specified for a given envelope. In Sendmail it is Called “MaxRecipientsPerMessage”.

RealSender promotes the limit on the number of recipients per message,
to reduce abuses and to avoid the risk of sending cc/bcc to many addresses.

We share a list of 300 @emailnull.com addresses for testing:
emailnull-test.txt

The messages will reach a “black-hole” mailserver.

You can use them at your convenience,
to check how many recipients per message
your smtp server allows the sending to.

limit messages weight

If you send a large attachment to someone,
it may not go through as their incoming attachment size may be smaller.

The “limit message weight” option lets you define a maximum message weight
so that they will be blocked even before uploading them.

The sending of overweight attachments is stopped,
the email gets bounced back immediately to the sender,
with a warning like:

The message you are trying to send exceeds 
the global size limit of (xxxx bytes) of the server, 
reduce the size of the message and attempt to send again.

convert large attachments

RealSender “filelink” app automatically converts
all attachments larger than the size that you define
into a link, like this:

[large file example.pdf] (43.96 MB) moved to:

http://rsXXX-realsender.com/files/e1eb3665a1a0766ea65616b6210cfd538c4950f8.pdf

The file will be DELETED after twelve months.

Your recipient receives a light message.
He can download the attachment when he needs it.

The domain in the link can be any dedicated domain or subdomain you wish to use.

bcc of all sent emails

Email messages are the main channel of modern business communications.
Their accidental loss would great damage the company’s knowledge base.
Furthermore, business correspondence should generally be kept for up to ten years.

 !! if your company is using personal mailboxes
 such as name.surname@companyname.com  
 you must have informed the senders before activating this function

Using the bcc (blind carbon copy) function,
RealSender transparently transfers all the sent emails

• to a special pop3 mailbox
  configured to receive large amounts of emails in a short time
  
  you can automatically download it via external services
  !!! stored email messages are automatically deleted after 7 days !!!
  
  for example using the “Check mail from other accounts” setting
  available within Gmail, both individual (free) and G Suite App versions

• to a different email address
  properly configured so that the messages are not classified as spam
  
  Gmail G Suite App gives the option to “Set up an inbound mail gateways”