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How do I remove maximum limit size for email?

Posted June 7, 2015 31k views
DebianEmailDigitalOcean ArticlesConfiguration Management

I have successfully set up an email server using this tutorial: [How To Configure a Mail Server Using Postfix, Dovecot, MySQL, and SpamAssasin](https://www.digitalocean.com/community/tutorials/how-to-configure-a-mail-server-using-postfix-dovecot-mysql-and-spamassasin) but there appears to be some sort of limit to the size of email attachments I can send or receive. It means I have to resize photographs before sending them and my correspondents cannot understand why they cannot send me pictures either. I need this communication for my work.

Can anybody please tell me where to find where such limits are set among the huge plethora of configuration files in this set up? I have been steadily ploughing through them but it is taking far too long and there are still far to many left to plough through.

I believe it is the server, not the client. But just in case it helps, the client is Thunderbird.

TIA.

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freshscaped
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3 answers
eldin June 7, 2015

Welcome to DigitalOcean.

To change the maximum limit you need to edit /etc/postfix/main.cf

Search for message_size_limit using :

nano /etc/postfix/main.cf

Use Google to calculate Bytes to GB (1GB in Bytes) for e.g. 1GB are 1000000000 Bytes

now change message_size_limit to e.g. message_size_limit = 1000000000 if you want 1GB

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  • pjw July 19, 2017

    Are there any policy or other limits that could prevent those limits to be applied?
    I am unable to send a message larger than default setting to user accounts.

    My config:
    postconf -n | grep size
    mailboxsizelimit = 0
    messagesizelimit = 35720000
    virtualmailboxlimit = ${messagesizelimit}0

    The error I am getting on sending side:
    552 Requested mail action aborted: exceeded storage allocation

    I am obviously missing something here.

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freshscaped June 7, 2015

That line currently reads “mailboxsizelimit = 0” which, if I understand it correctly, means unlimited in postfix. That’s how I want it. I don’t want a limit set anywhere else either. However, I believe that line refers to the total amount of all the emails, aggregated together, which can be held within a mailbox, not to the maximum size of any one email including attachments.

As it stands I cannot send more than a couple of photos under 1MB and none over 1MB. Which actually confirms the line quoted does not mean zero size of either the mailbox or of the individual messages therein.

I have no wish to change the limit to any particular size. I want to remove it altogether so the arithmetic, which I understand perfectly well already thanks, is irrelevant. But where, if not in /etc/postfix/main.cf, is a limit being imposed?

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  • eldin June 7, 2015

    @freshscaped you are right. The line mailbox_size_limit = 0 says that the User e.g. user@example.com has unlimited storage for his mailbox.

    As i understand you want change the “limit to the size of email attachments I can send or receive” to unlimited, for that you need to change message_size_limit to message_size_limit = 0.
    If you don´t have the line message_size_limit just add message_size_limit = 0 for unlimited size of email attachments.

    Sorry I did not read that you wanted unlimited size of email attachments, that is the reason I explained it with 1GB.

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freshscaped June 7, 2015

Thanks Eldin. That’s done the trick. Sorry, I misread your response at first pass. The message size limit line was indeed missing.

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