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S / MIME / smime.p7s attachments can block Mail on iPhone

For some time, there is something strange on many iPhone smartphones when a "smime.p7s" message is received on the Mail app. This is the native application found on all iOS operating systems.

data Prostated problems:

An e-mail is sent to the iPhone on which a document file is accompanied by a certificate smime.p7s. After receiving this message, when trying to download it in the background, the iOS Mail application is unusable or suddenly shuts down.
Delete the message on iPhone (if this is done) is not a solution. Deleted emails will automatically go to a "Trash" folder where you will still try downloading the encrypted file and the problem will persist.

What are the S / MIME attachments (smime.p7s)

When you receive a mail document from an institution or a bank, it is very likely that it is accompanied by a smime.p7s file. you will not torture to open this file because you can not. S / MIME (Secure Multipurpose Internet Mail Extension) provides additional security for messages sent from an account Exchange ActiveSync.
S / MIME contains two main components: digital signature si encryption.

Electronic signature, check if the email was sent by the sender. This avoids sending messages by viruses from an email address. To send these e-mail messages, a single electronic certificate for each user is installed.

encryption is a way to secure the information so that it can not be read unless the message is brought to a decipherable state. This is also the smime.p7s file. This encryption key provides security for the message when it is in transit or when it is stored.

It is very possible that iOS does not understand this kind of e-mail messages coming encrypted from Exchenge on the iPhone's Mail application, and consequently the error that leads to the sudden shutdown of the application appears.

How do I resolve the issue of closing the Mail application on iPhone / iOS

If you received such an email massage, accompanied by an S / MIME encrypted file and the Mail application is no longer working, it is best to go to the webmail or other mail client where you can access your account e-mail you received the message and also delete it from "Trash" / "Trash". Of course, not before saving on the PC / Mac the important data in the message. Typically, this file type accompanies attachments in PDF or .DOCX format.
After you delete the message, close and restart the iPhone, and then open Mail. This may suddenly close once, after which everything will return to normal.

As far as we are concerned, we have been experiencing this problem for a long time with all the messages we have received from Raiffeisen Bank.


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