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How to open PEC attachments

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How to open PEC attachments: Recently, you have had the need to open a PEC box to send and receive some files that you absolutely need. If the sending did not give you problems, a different story, however, turned out to be the reception of the attachments: you cannot download them as you usually do, since all the programs you have used so far only manage to show you a “summary” part of the email, very different from the actual message and which, above all, does not contain the files of your interest.

What you may be unaware of is that, on some software and apps,  opening PEC attachments  is not an “immediate” operation, but requires some intermediate steps due to their only partial compatibility with certified e-mail: in this guide I will take care to explain everything you need, from opening the PEC attachments through the Web interfaces and dedicated apps made available by the various services, to viewing them through the most used programs for managing e-mails.

So, without waiting a moment longer, take a few minutes of your free time and read very carefully everything I have to explain on this topic: I guarantee that, once you have completed the reading of this guide, you will be able to act in total autonomy, regardless of the device and operating system you are using. Having said that, I just have to wish you good reading and good work!


How to open PEC attachments online

Most certified e-mail services provide an online Webmail service , accessible via any browser, useful for reading received messages and for downloading and / or opening files attached to them. In general, all you need to do to use it is to connect to the login page of the service, enter your login credentials and, once you have reached the inbox , select the message that contains the attachment and  download  it using the appropriate item / button.

As for the InfoCert Legalmail service, for example, you need to connect to this website , enter the user ID / PEC address and  password  in the appropriate text fields and click on the  Login button to enter the certified e-mail box.

Next, click on the  Inbox  folder located on the left side of the page, highlight the message containing the attachment of your interest (the presence of the attached file is identified by a small  paper clip icon ) and, when it is opened , move to the part containing the email and scroll down the message, until you find the  Attachments section . At this point, you simply need to click on the file of your interest, indicate the folder on your computer in which to save it and open it with the most suitable program (eg  Word  for .docx files).

Unfortunately, I cannot provide you with precise information on all the existing PEC Webmail services, as there are so many! However, I can assure you that the instructions I have provided you just now can be easily used to  open PEC attachments for Aruba , Postecert (Poste Italiane) and many other similar services.

How to open PEC attachments on PC

You followed my guide on how to enter another email from a client to configure the PEC mailbox in the email program you usually use on Windows , but now you don’t have the faintest idea how to manage the attachments received? No problem! Below I will provide you with the information you need to act through the most popular clients dedicated to the Microsoft operating system: Windows 10 Mail and Outlook .

Windows 10 Mail

To open PEC attachments in Windows 10 Mail , first start the program and select the  Inbox  folder for your certified mail account.

Once this is done, click on the message that contains the attachment you want to open, click on the  postacert.eml  file present in it and, in the new page that opens, locate the attachment of your interest: usually, the list of attached files is specified at the top of the email message.

At this point, you just have to click on the attachment to open it immediately using the most suitable program, or right-click on its preview and select the  Save  item from the menu that appears, to download it to your computer.


The functioning of Outlook is quite similar to what we saw previously: after starting the program, click on the arrow located next to the certified e-mail account of your interest, to access the list of folders that are part of it, click on  Mail incoming  and, from there, select the message that contains the attachment of your interest.

At this point, move to the right part of the window, click on the  postacert.eml  file to open the actual mail message and, in the screen that appears and locate the preview of the file you are interested in viewing; at this point, click on the  ▼  button corresponding to it and, using the menu that appears, choose whether  to Open  the attachment,  Print itSave it  or  Upload it  to the cloud.

How to open PEC attachments on Mac

Opening PEC attachments on Mac is not difficult: even in this case, if you wish, you can act directly via the Internet page of the service you have chosen, as seen in the previous chapter , or if you have configured the PEC mailbox in the Mail or Outlook programs , you can refer to the steps that I am going to show you below.


Opening PEC attachments via Mail , the standard e-mail program included in macOS, is simply disarming to say the least. To succeed in the enterprise, start the program by recalling it from the Dock bar  (the stamp -shaped icon  ), click on the Inbox folder  relating  to the PEC address that you had previously configured and, later, open the e-mail message that contains the attachment of your interest.

At this point, scroll down the aforementioned message, double-click on the  postacert.eml file at the bottom (the one that contains the real content of the email) and, once the next screen is open, go to the bottom of the email and identify the attachment area, where you should find the file you were looking for. At this point, right-click on it and, through the menu that is proposed to you, choose whether  to open  the attachment,  save it , copy it or share it .


Do you need to open the attachments received in your PEC account configured in Outlook for Mac ? I think I have very good news for you. You should know that the operation of the dedicated macOS version of Microsoft’s email client is extremely similar to its counterpart for Windows. For this reason, you can follow the same steps seen above to be able to open and / or download the attached files of your interest.

How to open PEC attachments on Android

As for the management of PEC attachments on Android , you can choose at least two different methods: the first is to download them or view them through the apps made available by the PEC services ( Aruba , Legalmail , Postecert and so on), the second, instead , is to use a special e-mail client, for example K9 Mail . Find everything explained below.

PEC official apps

Some of the most well-known providers of PEC accounts, such as  Aruba and  InfoCert / Legalmail , for example, have dedicated apps for accessing certified e-mail via an Android device. In this case, the attachment management is quite simple: all you have to do is start the app, configure the PEC box (indicating, where required, username and password to access the service), open the  inbox  . and select the message that contains the attachment of your interest. Once this is done, all you have to do is identify the section relating to the  attachments  and press on the option relating to the  download  of the same.

If you use the PEC of InfoCert , for example, you must download the  Legalmail app for Android : after installing it, indicate the email address  and  password  of the mailbox in the proposed fields and press the  Next button  to log in and view the  Inbox folder immediately .

At this point, tap on the message of your interest and scroll down the screen, until you reach the end of the email: immediately after the signature, there should be a  dotted box containing the file attached to the message (even more than one, in the case of multiple files). To download the file to your phone, tap on the box and, to open it, press the file icon again. That’s all!

Unfortunately I am not able to provide you with precise instructions for all existing PEC apps but, as I have already mentioned above, the steps are more or less the same as those already seen.

Gmail / EML Reader Free

If your PEC provider does not provide any proprietary app, you can download the messages received in your mailbox using a third-party app, such as K-9 Mail , an open source client available for free on the Play Store .

In this way, however, you will not be able to view the body of the message or its attachments, since this information is “encapsulated” in an .eml file , which in turn is attached to the PEC message: in order to manage this type of file, you must also download the EML Reader Free app , also available for free on the Play Store .

After downloading and installing both apps, start K9-Mail , tap the  Next button , indicate your  PEC email address  and the relative  password  in the appropriate fields, tap the  Manual configuration  button and then the  IMAP button ; at this point, fill in the proposed form with the IMAP  (incoming mail) parameters relating to your PEC mailbox, touch the  Next  button again and indicate, on the next screen, the  SMTP  (outgoing mail) parameters relating to your account. Below I indicate the IMAP / SMTP parameters of the best known PEC services agents in Italy.

  • Aruba
    • Incoming mail server (IMAP) :; Port: 993, SSL: yes;
    • Outgoing mail server (SMTP) :; Port: 465; SSL: yes; Authentication: Yes.
  • Postecert
    • Incoming mail server (IMAP) :; Port: 993, SSL: yes;
    • Outgoing mail server (SMTP) :; Port: 465; SSL: yes; Authentication: Yes.
  • Kolst
    • Incoming mail server (IMAP) :; Port: 993, SSL: yes;
    • Outgoing mail server (SMTP) :; Port: 465; SSL: yes; Authentication: Yes.
  • Legalmail
    • Incoming mail server (IMAP) :; Port: 993, SSL: yes;
    • Outgoing mail server (SMTP) :; Port: 465; SSL: yes; Authentication: Yes.
    • Incoming mail server (IMAP) :; Port: 993, SSL: yes;
    • Outgoing mail server (SMTP) :; Port: 465; SSL: yes; Authentication: Yes.
  • Free PEC
    • Incoming mail server (IMAP) :; Port: 993, SSL: yes;
    • Outgoing mail server (SMTP) :; Port: 465; SSL: yes; Authentication: Yes.

When you are finished, tap the  Next button again , set the synchronization and notification options, using the proposed screen, tap  Next  again and indicate an  account name  (to identify it in the app) and  your name  (which will be displayed in the sent messages). Finally, press the  Done button and tap the icon of the PEC just configured.

Once in the  Inbox , identify the message of your interest, tap it and scroll down the page until you find the  postacert.eml attachment , then press the  Save  button corresponding to it to keep a copy in the folder  Android download  .

At this point, open the EML Reader Free app  , tap the folder  -shaped icon  located at the top and go to the Download folder  , available among those listed, then tap on the  postacert.eml  file saved previously. The game is practically done: scroll to the bottom of the screen that is proposed to you and, after identifying the  Attachments box , make a  long tap  on the file of your interest and indicate whether to  Open it ,  Save it  or  Share  it using the menu displayed on the screen.

How to open PEC attachments on iPhone

The steps necessary to  open PEC attachments on iPhone  do not differ much from what has already been seen on Android: even in this case, you can use the apps made available by the most popular PEC services or use Mail , the e-mail client included “di series ”in iOS.

PEC official apps

Exactly as already seen for Android, services such as Aruba and Legalmail provide apps dedicated to the management and display of certified e-mail (with related attachments) specific for iPhone and iPad. The operating modes are identical to those already seen for Android, so I invite you to consult the dedicated section for further information on this.


If you are unable to rely on a “proprietary” app, you can configure your PEC account in the iOS Mail client and view the attachments received from there.

How? I’ll explain it to you right away. First, open the  iPhone Settings  by tapping the gear  icon attached to the Home screen of the device, then tap the  Password and Account  items (on iOS 14 and later you need to go to Settings> Mail or Settings> Contacts ) and  Add account  to add the PEC mailbox to the mail client.

At this point, touch the  Other  and  Add Mail account items , indicate your  name , your  PEC  email and the  access password  in the appropriate fields, tap on the  Next item, then on the IMAP tab  , and fill in the entries relating to the server using the most appropriate settings for your service, which I have indicated to you in this section .

Note : If necessary, re-enter your username and password in the Incoming and Outgoing Mail Server fields as well.

After adding, make sure that the  Mail  lever is moved to  ON  to activate the automatic synchronization of messages and press the  Save  button to finalize everything.

Then, start the Mail app  , tap the  Mailboxes  item to access the list of configured accounts, tap the item relating to the PEC just added and, once the  inbox is open , tap the message you want to view the attachment.

Once this is done, scroll down the email you just opened, tap the  postacert.eml  box to open the complete email message, go to the end of it and tap on the attachment of your interest to open it and possibly download it.