1. The server is designed to block attachment types which are seen as a danger if they are not zipped up.
Some attachment types that are blocked are: .bat .src .exe. The reason
for this is that your mailbox would be flooded every day with viruses
if this was not in place. A few attachments that are fine without
zipping up are: .gif .jpg .html .pdf. Unfortunately, there is no way to
turn this off so your only option is to zip your attachment or doing
the below.
2. Another reason could be the size of the attachment if
you're sending an attachment that is 10 MB or larger, it will fail due
to the size.
If you are sending it from webmail this limit is less than 2 MB. A
better option to get around these limits would be to upload the file to
your site and give out the link instead. You could even password
protect so the public cannot view or access the file.
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