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#1
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Blocked my attachment
All my accounts GMAIL ! Sending a .zip file to one of my other accounts. GMAIL blocks it ! How do I send it ? |
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#2
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Blocked my attachment
On Tue, 3 Jul 2018 10:28:44 -0700, freeburn wrote:
All my accounts GMAIL ! Sending a .zip file to one of my other accounts. GMAIL blocks it ! See https://support.google.com/mail/answer/6590 Gmail does not block all .zip files. Gmail only blocks a .zip file when the .zip file contains another file that is on Gmail's block list. For example if the .zip file contains a .exe file, then the .zip file would be blocked in order to block the .exe file. How do I send it ? A. You could remove the .exe file or other "potential security issue" file type from inside the .zip file B. Or, you could follow Gmail's instructions he 1. Go to Gmail's support page for this issue https://support.google.com/mail/answer/6590 2. Under "Why messages get blocked", click on "Messages that have attachments" to expand it. 3. Read the part "What you can do". -- Kind regards Ralph |
#3
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Blocked my attachment
Ralph Fox wrote:
freeburn wrote: All my accounts GMAIL ! Sending a .zip file to one of my other accounts. GMAIL blocks it ! See https://support.google.com/mail/answer/6590 Gmail does not block all .zip files. Gmail only blocks a .zip file when the .zip file contains another file that is on Gmail's block list. For example if the .zip file contains a .exe file, then the .zip file would be blocked in order to block the .exe file. Then rename the file before zipping it. If Google is searching on particular filenames, even inside a .zip file, it won't get a hit if the filename isn't on its list. An even easier way to get around such trivial checks is to rename the file to have a different extension, like changing file.exe to file.exx. Possibly Google could look inside the file to see there is the 80-byte header for an .exe file but I doubt Gmail is going beyond looking at filetypes even inside of a .zip file. Send file.exe as file.exx and in the body of the message tell the recipient to rename back to file.exe. I just tested this. I copied an .exe file into my %temp% folder and renamed it to .exx. In the Gmail webclient, I composed a new e-mail and attached the .exx file. Not only did Gmail upload the .exx file to attach while composing but it also sent the e-mail to my other account with the .exx file attached. Testing for candidate malicious files by filetype is a stupid method of looking for executable attachments. A file can have any extension (aka filetype) in its name whether it be .exe or .exx or something else. Extensions are only hints at how the file might get used, not how it must be used. Changing .exe to .exx is proof that filetype blocking is a poor method of deterring executables from arriving via e-mail. No need to use Google Drive to workaround simple filetype blocking. |
#4
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Blocked my attachment
On Tue, 3 Jul 2018 13:35:58 -0500, VanguardLH wrote:
Testing for candidate malicious files by filetype is a stupid method of looking for executable attachments. A file can have any extension (aka filetype) in its name whether it be .exe or .exx or something else. Extensions are only hints at how the file might get used, not how it must be used. Changing .exe to .exx is proof that filetype blocking is a poor method of deterring executables from arriving via e-mail. Changing the extension of an executable from .exe to .exx helps to prevent accidental launching of that executable, so in that sense it's not stupid at all. -- Char Jackson |
#5
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Blocked my attachment
Char Jackson wrote:
On Tue, 3 Jul 2018 13:35:58 -0500, VanguardLH wrote: Testing for candidate malicious files by filetype is a stupid method of looking for executable attachments. A file can have any extension (aka filetype) in its name whether it be .exe or .exx or something else. Extensions are only hints at how the file might get used, not how it must be used. Changing .exe to .exx is proof that filetype blocking is a poor method of deterring executables from arriving via e-mail. Changing the extension of an executable from .exe to .exx helps to prevent accidental launching of that executable, so in that sense it's not stupid at all. For filtering, yes, inane. That's what I was addressing. Renaming executables is considerate polite to the recipient to prevent accidental execution. Depends on the intelligence of the recipient (if you know the recipient, that is). |
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