[k-9-mail] Unable to send email with large size attachments

[Honna Smal]

Hello,

What is the maximum size for sending emails with large attachments?
I could not email an attachment of over 4 MB via public wifi nor via my own
home wifi.
Strangely enough, those emails were removed from the Out map into the Send
map. So to me it looked as if the emails were actually send. Only this
appeared not to be the case.

Otherwise I am a very happy user of K9 mail. So I would really like to know
what I should know about attachments that i can email.

Many thanks in advance.

Honna Smal

[David W. Jones]

Post by Honna Smal
Hello,
What is the maximum size for sending emails with large attachments?
I could not email an attachment of over 4 MB via public wifi nor via my own
home wifi.
Strangely enough, those emails were removed from the Out map into the Send
map. So to me it looked as if the emails were actually send. Only this
appeared not to be the case.
Otherwise I am a very happy user of K9 mail. So I would really like to know
what I should know about attachments that i can email.
Many thanks in advance.
Honna Smal

Hmm, outgoing mail size limits are usually set by the mail service provider, right?
David W. Jones
***@gmail.com
wandering the landscape of god
http://dancingtreefrog.com

Sent from my Android device with F/LOSS K-9 Mail.

[Uwe Deutscher]

I often expierienced a similar issue after sending a big amount of small files with K-9.

K-9 moved them from out to sent and I thought the mail went well.

But the receiver complained about having got empty files.

When I opened my sent mail in the sent folder, I noticed that only some of those files had a size of 0 kB.

This happened several times whenever I tried to send big amounts of about 12+ attachments each of minor size.

So now I always check the sent mail folder whether the size of attachments is all right.

When I try to delete a big amount of mails 200+ K-9 usually crashes.

So I assume it has stack issues handling very many items.


Uwe


-------- Ursprüngliche Nachricht --------
Von: "David W. Jones" <***@gmail.com>
Gesendet: 17. November 2018 00:23:37 MEZ
An: k-9-***@googlegroups.com
Betreff: Re: [k-9-mail] Unable to send email with large size attachments

Post by Honna Smal
Hello,
What is the maximum size for sending emails with large attachments?
I could not email an attachment of over 4 MB via public wifi nor via my own
home wifi.
Strangely enough, those emails were removed from the Out map into the Send
map. So to me it looked as if the emails were actually send. Only this
appeared not to be the case.
Otherwise I am a very happy user of K9 mail. So I would really like to know
what I should know about attachments that i can email.
Many thanks in advance.
Honna Smal

Hmm, outgoing mail size limits are usually set by the mail service provider, right?
David W. Jones
***@gmail.com
wandering the landscape of god
http://dancingtreefrog.com

Sent from my Android device with F/LOSS K-9 Mail.

[Greg Troxel]

Post by Honna Smal
What is the maximum size for sending emails with large attachments?

I am not sure that k-9 has a specific limit. But I sent things over 4
MB, perhaps even close to 20 MB, fairly often, with no trouble. I've
been reading the k-9 mail list for years, and have not seen similar
reports of trouble.

Keep in mind that a 3 MB file is a 4 MB attachment, more or less, with
base64 encoding.

Mail servers have a configured size limit, as David said. But it would
seem odd, these days, for 4 MB to run afoul of that.

Post by Honna Smal
I could not email an attachment of over 4 MB via public wifi nor via my own
home wifi.

To debug this, you need to look at the server logs, and see what the
server recorded.

Also, set up adb and see what k-9 logs.

You say "could not", but that is not specific enough. For people to
help you, you need to be describe more details, including the timeline
from pressing send and the precise error you received.

You say "could not" about "public wifi" and "home wifi", but do not
mention cellular, or anything else. Do you mean "I tried those two
things, and can't readily try anything else, and I have never seen it
work"?

You didn't explain if regular text mail works, and if you have tried
successively smaller attachments to find a magic size. Or if your mail
provider has a mail size limit.

You also did not explain if you have set up another email provider and
tried that, or a different client (thunderbird on desktop) to see if
that has the same issue.

Post by Honna Smal
Strangely enough, those emails were removed from the Out map into the Send
map. So to me it looked as if the emails were actually send. Only this
appeared not to be the case.

adb logs may be helpful. The message going from the Outbox to the Sent
folder is not proof that they actually were sent, but evidence that k-9
thought they were accepted by the first-hop server.

Overall, I suspect you will find a problem in the email service (or
perhaps a network which only allows limited-size connections??), and not
in k-9.

Greg

[David W. Jones]

Post by Greg Troxel

Post by Honna Smal
What is the maximum size for sending emails with large attachments?

I am not sure that k-9 has a specific limit. But I sent things over 4
MB, perhaps even close to 20 MB, fairly often, with no trouble. I've
been reading the k-9 mail list for years, and have not seen similar
reports of trouble.
Keep in mind that a 3 MB file is a 4 MB attachment, more or less, with
base64 encoding.
Mail servers have a configured size limit, as David said. But it would
seem odd, these days, for 4 MB to run afoul of that.

Post by Honna Smal
I could not email an attachment of over 4 MB via public wifi nor via

my own

Post by Honna Smal
home wifi.

To debug this, you need to look at the server logs, and see what the
server recorded.
Also, set up adb and see what k-9 logs.
You say "could not", but that is not specific enough. For people to
help you, you need to be describe more details, including the timeline
from pressing send and the precise error you received.
You say "could not" about "public wifi" and "home wifi", but do not
mention cellular, or anything else. Do you mean "I tried those two
things, and can't readily try anything else, and I have never seen it
work"?
You didn't explain if regular text mail works, and if you have tried
successively smaller attachments to find a magic size. Or if your mail
provider has a mail size limit.

Just guessing that Honna's trying to send using mail.com account, they say their size limit is 50MB:

https://www.mail.com/mail/attachments-up-to-50-MB/499458-large-email-attachment-limit.html#more_capacity_mailcom_50_mb_email_attachment_limit

Post by Greg Troxel
You also did not explain if you have set up another email provider and
tried that, or a different client (thunderbird on desktop) to see if
that has the same issue.

Post by Honna Smal
Strangely enough, those emails were removed from the Out map into the

Send

Post by Honna Smal
map. So to me it looked as if the emails were actually send. Only

this

Post by Honna Smal
appeared not to be the case.

adb logs may be helpful. The message going from the Outbox to the Sent
folder is not proof that they actually were sent, but evidence that k-9
thought they were accepted by the first-hop server.
Overall, I suspect you will find a problem in the email service (or
perhaps a network which only allows limited-size connections??), and not
in k-9.
Greg

David W. Jones
***@gmail.com
wandering the landscape of god
http://dancingtreefrog.com

Sent from my Android device with F/LOSS K-9 Mail.

[Honna Smal]

Hello to you all,

Thanks a lot for your input.

In the mean time I have been investigating further.
The problem occured not via wifi, but via my GSM provider.
They claim to have no limits.
And K-9 mail is said to have no limits.

I managed last week to send a file of nearly 4 MB via the mobile internet
provider.

Then I asked the mailprovider who takes care of the sending of my emails.
Via webmail the limit is 10MB and you get a warning.
So in K-9 mail I don't get a warning.
Emailing via my home wifi with K-9 mail 4 attachments , in total about 12
MB is transferred without any problem.

My conclusion is, that it was probably, something in the mobile internet
connection was not solid enough at that moment.
That seeing a mail in your Send box is no proof of actual transfer.
That there are no limits in data mail transfer that restrict me.
But that, while at home, I will keep using software like WeTransfer.

Best regards,

Post by Honna Smal
Hello,
What is the maximum size for sending emails with large attachments?
I could not email an attachment of over 4 MB via public wifi nor via my
own home wifi.
Strangely enough, those emails were removed from the Out map into the Send
map. So to me it looked as if the emails were actually send. Only this
appeared not to be the case.
Otherwise I am a very happy user of K9 mail. So I would really like to
know what I should know about attachments that i can email.
Many thanks in advance.
Honna Smal