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A sender reputation is lost in one send and rebuilt over weeks. Lekalao applies several guardrails on its own.

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The automatic guardrails

Every recipient of a campaign has one send of their own. Picking up after a failure, a double click or a restart never produces a duplicate.
The rate set on each mailer is respected; beyond it, e-mails wait.
The big mailboxes do not like receiving thousands of e-mails at once from a new sender. By default, per minute: 300 to Gmail, 200 to Outlook, Hotmail, Live and Yahoo, 120 to Orange, 600 to every other domain. The e-mails over that wait for the next minute.
After 500 e-mails, a campaign that goes past 0.1 % complaints (at least 3) or 5 % bounces (at least 10) pauses itself, with the reason and a warning e-mail. Resuming is up to you. See Send a campaign.
Hard bounces and complaints block the address for the whole team, on every list. See Suppression list.
No campaign without an unsubscribe link and a postal address. One-click unsubscribe (RFC 8058) in every campaign and automation e-mail.
The thresholds can be changed by the installation’s administrator: see Configuration.

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Good practice

1

Authenticate the domain

SPF, DKIM and DMARC in place, and a tracking host when you can. See Sending domains.
2

Wire the feedback up

Without a feedback webhook, bounces and complaints are not handled. See Provider feedback.
3

Warm up

On a new domain or a new provider, start with your most active readers (an Engagement segment), spread the sending, then widen over two to four weeks.
4

Use double opt-in

It keeps out typos, spam traps and malicious subscriptions.
5

Clean up regularly

Win back, then unsubscribe, the people who have been inactive for six months; leave the automatic deletion of the unconfirmed on.
6

Write like a human being

An honest subject, a recognisable sender, as much text as images, an unsubscribe link that is easy to find: a reader who cannot find the link clicks “Spam” instead.

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Watching

  • Settings → Deliverability: the bounce and complaint rates of the last thirty days, in red past the thresholds.
  • The statistics of each campaign: reception, bounces, complaints.
  • Google Postmaster Tools and Microsoft SNDS, to see your reputation from inside the mailboxes.