Opened 3 months ago

Closed 2 months ago

#16596 closed Bug/Something is broken (fixed)

Issue with

Reported by: NLGSF Staff Owned by:
Priority: Urgent Component: Tech
Keywords: Cc:
Sensitive: no


A error message keeps popping up that emails from our Protonmail accounts can't be sent out to the mailing list even though there is no size limit and the attachment file size is relatively small (14 mb).

This is the message that is received:

<right-to-shelter@…>: message size 20579018 exceeds size limit

6720000 of server[]

---------------------------------------------- message/delivery-status ---------------------------------------------- Reporting-MTA: dns; X-Postfix-Queue-ID: 4GVNyd6rrqz4wwcj X-Postfix-Sender: rfc822; econner@… Arrival-Date: Wed, 21 Jul 2021 18:14:33 +0000 (UTC)

Final-Recipient: rfc822; right-to-shelter@… Original-Recipient: rfc822;right-to-shelter@… Action: failed Status: 5.3.4 Diagnostic-Code: X-Postfix; message size 20579018 exceeds size limit 6720000 of


---------------------------------------------- text/rfc822-headers ---------------------------------------------- Return-Path: <econner@…> Date: Wed, 21 Jul 2021 18:14:31 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;;

s=protonmail2; t=1626891276; bh=i8gK7r98Nu50tXHP6Hcd/YezkaIFm64kiAzGKfeqcnc=; h=Date:To:From:Reply-To:Subject:From; b=XDmeQ4hoTxM6e0Y+/jZf+3H3LY7vgRLszPA15dEKVwmkBbdT77FVHhnv+h+vHZzeF

swT3QkKBHCoGXlsEj8OVsU0yfFnXyTHoENQnnoO+tZs8LEcfCI+lxP7QqKJCOhox74 zHKEZQqYk4/rIRzzAbmbah1chm1eIwlZZLezxuuB1QSUutWrxCnClc+B68S2TE/oJO B0NlYYkAvqentny/UV5SqZEwqncHZRkoqWDTU8rlH7T6SKGWZWCceuZSLe48l1Oqg8 88GLidBy6r6tKOlP8bdk6RzIT+Ka/xf0c0UzWQMnarkZmTOm81QYs4X8kp+Gpr8EfU EQ62uhLQVjMOw==

To: right-to-shelter@… From: E Conner <econner@…> Reply-To: E Conner <econner@…> Subject: PLEASE SHARE: August 4th- Eviction Defense LO Training Message-ID: <92028295-3BAD-4831-BC18-8DAA5BD7A8C6@…> MIME-Version: 1.0 Content-Type: multipart/mixed;


X-Spam-Status: No, score=-1.2 required=10.0 tests=ALL_TRUSTED,DKIM_SIGNED,

DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,GB_FAKE_RF_SHORT,HTML_MESSAGE shortcircuit=no autolearn=disabled version=3.4.4

X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on

We have forwarded this issue to Protonmail support but I believe it may be an issue of the listserv itself.

The listserv isn't functional at the moment and we'd like to send out urgent updates as soon as possible.

Thanks in advance for your help!

Change History (3)

comment:1 Changed 3 months ago by JaimeV


So this message definitely related to May First and is coming from the underlying smtp server that handles sending e-mail for the Mailman mailing list software. On this server we have set a total message size limit of 20MB including headers,body and all attachments of an e-mail.

We've implemented this limit for well though out reasons to ensure the stability of our mailing list infrastructure.

The workflow we suggest/prefer is to upload large files to your website or our Nextcloud service at , create a share link for the file, and send the link to your e-mail list.

I know that means an extra step, but it is also a much more efficient use of resources as recipients can download the file as needed. Enclosed e-mail attachments immediately begin to take up disk extra disk storage, cycles, and energy as they are reproduced across the mail servers of all recipients, often multiplying even more when there are bounces or failed deliveries for any reason.

comment:2 Changed 2 months ago by Jamie McClelland

Resolution: fixed
Status: newfeedback

comment:3 Changed 2 months ago by NLGSF Staff

Status: feedbackclosed

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