https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=43340
Bug ID: 43340
Summary: Koha's SMTP connection rate can trigger errors
Initiative type: ---
Sponsorship ---
status:
Product: Koha
Version: Main
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: P5 - low
Component: Notices
Assignee: [email protected]
Reporter: [email protected]
QA Contact: [email protected]
CC: [email protected]
Target Milestone: ---
When sending email, Koha creates a new SMTP connection for each message. Every
single notice does a full connect:
EHLO => STARTTLS => auth => send => quit
A burst of notices means dozens of connections in seconds from one IP. In
practice, this seems to trigger Goggole's Google's per-IP connection rate
limiting, which responds with 421-4.7.0 at EHLO.
Koha doesn't limit simultaneous connections. There's only ever one connection
at a time (the cron is a single sequential process). The problem is connection
rate, and Koha has no throttle, delay, or connection-reuse.
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