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Prevent multiple copies of multiple attachments from downloading

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When I receive an email with several attachments, and I download them to my computer, I get multiple copies of each attachment. Example1: 2 attachments, Att1 and Att2 produces Att1, Att1_1, Att2, Att2_1 (four downloaded files instead of two). Example2: 12 attachments (i.e., monthly bank statements for a year) produces 12 copies of EACH document for a total of 144 downloaded files. If I select just one file at a time to download, I get just one file; but it would be nicer to select all of them and download without having to delete all the extras that result. Is there a way to fix this? Using Thunderbird 60.6.0 on Mac Sierra OS

When I receive an email with several attachments, and I download them to my computer, I get multiple copies of each attachment. Example1: 2 attachments, Att1 and Att2 produces Att1, Att1_1, Att2, Att2_1 (four downloaded files instead of two). Example2: 12 attachments (i.e., monthly bank statements for a year) produces 12 copies of EACH document for a total of 144 downloaded files. If I select just one file at a time to download, I get just one file; but it would be nicer to select all of them and download without having to delete all the extras that result. Is there a way to fix this? Using Thunderbird 60.6.0 on Mac Sierra OS

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Matt
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3288 solutions 22704 answers

and do you have an anti virus?

Did you manually set Thunderbird to not download emails automatically (the default)?

Do these names show up in the file system only, or are they showing in the attachment pane?

What type of files are they? Usually trouble is with PDF and Microsoft office documents, as they are the ones with malware and therefore the ones pulled to bits by anti virus programs looking for it.

and do you have an anti virus? Did you manually set Thunderbird to not download emails automatically (the default)? Do these names show up in the file system only, or are they showing in the attachment pane? What type of files are they? Usually trouble is with PDF and Microsoft office documents, as they are the ones with malware and therefore the ones pulled to bits by anti virus programs looking for it.

Question owner

I didn't see a preference for downloading emails automatically (emails are downloaded automatically, because I don't have a web-based email program).

I don't understand what you mean by "file system only." The attachments show up in the attachments section at the bottom of the email.

They are usually PDFs. They are not 'pulled to bits;' they download completely. The problem is multiple copies of the same PDF download.

I didn't see a preference for downloading emails automatically (emails are downloaded automatically, because I don't have a web-based email program). I don't understand what you mean by "file system only." The attachments show up in the attachments section at the bottom of the email. They are usually PDFs. They are not 'pulled to bits;' they download completely. The problem is multiple copies of the same PDF download.
Matt
  • Top 10 Contributor
  • Moderator
3288 solutions 22704 answers

DO YOU HAVE AN ANTI VIRUS? was the first question. I would expect you do and it is causing the trouble. Either way, I am unaware of any bugs in attachment handling that would split a single mime segment into multiples.

That you are seeing multiple indicates one of two things.

1. Your sender is sending malformed emails. This is quite common from many web servers that offer to mail stuff, as well as camera and other internet of things items. 2. Something is corrupting the original email.

tomhealycpa said

I didn't see a preference for downloading emails automatically (emails are downloaded automatically, because I don't have a web-based email program).

I suggest you have a look in account settings then. https://support.mozilla.org/en-US/kb/configuration-options-accounts#w_synchronization-storage-panel

I don't understand what you mean by "file system only." The attachments show up in the attachments section at the bottom of the email.

With the mangles names or without is the question. Or do they only show up when you choose to save the attachment.

They are usually PDFs. They are not 'pulled to bits;' they download completely.

And you know this how? I don't know. But you apparently are certain. Based on what fact is this certainty based. I do not know what actions are being taken by other software on your machine, and seriously I doubt you do either. Do you have an anti virus extracting, decoding, scanning, encoding and reforming your email? I have no idea about that either because you did not answer that question in your haste to demonstrate you are not familiar with the settings and don't know what a file system is.

The problem is multiple copies of the same PDF download.

While the content may or may not be identical, Att1, Att1_1, Att2, Att2_1 is NOT the same PDF when it comes time to decode the email body and turn it into human readable form.

I am trying to elicit sufficient information to determine what might be occurring. I certainly have no desire to gaze into a crystal ball and guess. With the information currently available that is all I can do.

Given apples file system has multiple streams that are actually used. It might be that the sender is sending in some way that multiple attachments are generated when they compose. It might be an "edge" device that scans all mail coming into your company for threats. It might be your corporate mail server, it might be your wifi router (not all are created equal), it might be the senders anti virus corrupting outgoing mail. There is a huge list of other possible causes.

DO YOU HAVE AN ANTI VIRUS? was the first question. I would expect you do and it is causing the trouble. Either way, I am unaware of any bugs in attachment handling that would split a single mime segment into multiples. That you are seeing multiple indicates one of two things. 1. Your sender is sending malformed emails. This is quite common from many web servers that offer to mail stuff, as well as camera and other internet of things items. 2. Something is corrupting the original email. ''tomhealycpa [[#answer-1207621|said]]'' <blockquote> I didn't see a preference for downloading emails automatically (emails are downloaded automatically, because I don't have a web-based email program). </blockquote> I suggest you have a look in account settings then. https://support.mozilla.org/en-US/kb/configuration-options-accounts#w_synchronization-storage-panel <blockquote> I don't understand what you mean by "file system only." The attachments show up in the attachments section at the bottom of the email. </blockquote> With the mangles names or without is the question. Or do they only show up when you choose to save the attachment. <blockquote> They are usually PDFs. They are not 'pulled to bits;' they download completely. </blockquote> And you know this how? I don't know. But you apparently are certain. Based on what fact is this certainty based. I do not know what actions are being taken by other software on your machine, and seriously I doubt you do either. Do you have an anti virus extracting, decoding, scanning, encoding and reforming your email? I have no idea about that either because you did not answer that question in your haste to demonstrate you are not familiar with the settings and don't know what a file system is. <blockquote> The problem is multiple copies of the same PDF download. </blockquote> While the content may or may not be identical, Att1, Att1_1, Att2, Att2_1 is NOT the same PDF when it comes time to decode the email body and turn it into human readable form. I am trying to elicit sufficient information to determine what might be occurring. I certainly have no desire to gaze into a crystal ball and guess. With the information currently available that is all I can do. Given apples file system has multiple streams that are actually used. It might be that the sender is sending in some way that multiple attachments are generated when they compose. It might be an "edge" device that scans all mail coming into your company for threats. It might be your corporate mail server, it might be your wifi router (not all are created equal), it might be the senders anti virus corrupting outgoing mail. There is a huge list of other possible causes.

Question owner

OK. I have looked at the link you sent; my settings match the defaults there. And I do have an antivirus. If I turn it off and try the multiple file download again I get the same result, as follows using as an example when there are 26 PDF files attached: Bank statement Jan18 Bank statement Jan18-1 Bank statement Jan18-2 ... Bank statement Jan18-26 Bank statement Feb 18 Bank statement Feb18-1 Bank statement Feb18-2 … Bank statement Feb18-26 etc.

I've turned the antivirus back on again.

You seem to be referring to emails that come encrypted or something like that. I did look at enigmail for a while, but decided it was not worthwhile and removed it. A client with whom I have exchanged encrypted documents for years using GPG had trouble with the way enigmail messed things up at his end.

I'm not using a mangle on my computer; that's for ironing sheets.

The list of PDFs in the attachments section of the email from a client is what I was expecting to be there, based on communication with the client. If I download each file separately, no duplicates download. It's only when I want to download all of them at once (by dragging them to the desired destination folder) do they multiply like rabbits.

Somehow, with multiple PDFs downloaded at once, the system appears to count how many unique PDFs there are, and proceeds to download each one that many times. It's a problem I never had with Entourage 2008.

Each one opens as expected in Acrobat Pro DC.

That last paragraph of yours makes no sense to me. I know you are throwing out a lot of possibilities there, but I think it's probably not a problem with TBird per se, but the way I'm using it.

But thanks for trying to help.

OK. I have looked at the link you sent; my settings match the defaults there. And I do have an antivirus. If I turn it off and try the multiple file download again I get the same result, as follows using as an example when there are 26 PDF files attached: Bank statement Jan18 Bank statement Jan18-1 Bank statement Jan18-2 ... Bank statement Jan18-26 Bank statement Feb 18 Bank statement Feb18-1 Bank statement Feb18-2 … Bank statement Feb18-26 etc. I've turned the antivirus back on again. You seem to be referring to emails that come encrypted or something like that. I did look at enigmail for a while, but decided it was not worthwhile and removed it. A client with whom I have exchanged encrypted documents for years using GPG had trouble with the way enigmail messed things up at his end. I'm not using a mangle on my computer; that's for ironing sheets. The list of PDFs in the attachments section of the email from a client is what I was expecting to be there, based on communication with the client. If I download each file separately, no duplicates download. It's only when I want to download all of them at once (by dragging them to the desired destination folder) do they multiply like rabbits. Somehow, with multiple PDFs downloaded at once, the system appears to count how many unique PDFs there are, and proceeds to download each one that many times. It's a problem I never had with Entourage 2008. Each one opens as expected in Acrobat Pro DC. That last paragraph of yours makes no sense to me. I know you are throwing out a lot of possibilities there, but I think it's probably not a problem with TBird per se, but the way I'm using it. But thanks for trying to help.
Matt
  • Top 10 Contributor
  • Moderator
3288 solutions 22704 answers

Open the message source. (ctrl+U)

Look for the content boundaries and see if the actual second file names are shown. The following is an example of my phone bill. (you can pay it if you like) so you will know what you are looking for.

Content-Type: application/pdf; name="TRPB_1_1422961412.pdf"
Content-Disposition: attachment; filename="TRPB_1_1422961412.pdf"
Content-Transfer-Encoding: base64

If the so called duplicates are shown in the email body, then the issue is not Thunderbird or how it is being used, it is the email itself.

If you have access to web mail with the same emails, try looking at he source in web mail. It has not been through that usual download and scan (which can be destructive) So provides an insight if is is something that is happening in the download process or before it arrives.

Note that it is in the reception process the anti virus may mangle the content. not the viewing process of the email. so turning it on and off on email you already have will not demonstrate anything useful. Turning it off and downloading such a mail from the mail server is when we might learn something.

What anti virus is it. While almost everything we know is about Windows and anti virus. They have a long history on that platform of turning life inside out. https://wiki.mozilla.org/Thunderbird:Testing:Antivirus_Related_Performance_Issues

Personally I see Anti virus as "trusted" malware in that the actions of anti virus products and malware are not much different.

Open the message source. (ctrl+U) Look for the content boundaries and see if the actual second file names are shown. The following is an example of my phone bill. (you can pay it if you like) so you will know what you are looking for. Content-Type: application/pdf; name="TRPB_1_1422961412.pdf" Content-Disposition: attachment; filename="TRPB_1_1422961412.pdf" Content-Transfer-Encoding: base64 If the so called duplicates are shown in the email body, then the issue is not Thunderbird or how it is being used, it is the email itself. If you have access to web mail with the same emails, try looking at he source in web mail. It has not been through that usual download and scan (which can be destructive) So provides an insight if is is something that is happening in the download process or before it arrives. Note that it is in the reception process the anti virus may mangle the content. not the viewing process of the email. so turning it on and off on email you already have will not demonstrate anything useful. Turning it off and downloading such a mail from the mail server is when we might learn something. What anti virus is it. While almost everything we know is about Windows and anti virus. They have a long history on that platform of turning life inside out. https://wiki.mozilla.org/Thunderbird:Testing:Antivirus_Related_Performance_Issues Personally I see Anti virus as "trusted" malware in that the actions of anti virus products and malware are not much different.