Did you just download a file that has a digital signature from 1&1 Mail & Media Inc. and wonder if the file is safe? If that's the case, please read on.
You will typically notice 1&1 Mail & Media Inc. when clicking to run the file. The publisher name is then displayed as the "Verified publisher" in the UAC dialog as the screenshot shows:

You can view the digital signature details for 1&1 Mail & Media Inc. with the following procedure:
Here's a screenshot of a file that has been signed by 1&1 Mail & Media Inc.:

As you can see in the screencap above, Windows states that "This digital signature is OK". This means that the file has been published by 1&1 Mail & Media Inc. and that no one has tampered with the file.
If you click the View Certificate button shown in the screencap above, you can examine all the details of the certificate, such as when it was issued, who issued the certificate, how long it is valid, and so on. You can also examine the address for 1&1 Mail & Media Inc., such as the street name, city and country.
Thawte Code Signing CA - G2 and thawte SHA256 Code Signing CA has issued the 1&1 Mail & Media Inc. certificates. You can also see the details of the issuer by clicking the View Certificate button shown in the screenshot above.
The following are the 1&1 Mail & Media Inc. files I've collected, thanks to the FreeFixer users.
| Detection Ratio | File Name |
|---|---|
| 0/42 | BHOXML.dll |
| 0/51 | mail.com_MailCheck.dll |
| 0/50 | mail.com_MailCheck.dll |
| 0/64 | mail.com_MailCheck_Proxy.dll |
The detection percentage is based on the fact that I've gathered 207 scan results for the 1&1 Mail & Media Inc. files. 0 of these scan results came up with some sort of detection. You can review the full details of the scan reports by examining the files listed above.
The analysis is done on certificates with the following serial numbers: