Deliverability is the ability of your emails to reach the inbox rather than spam, or not to be blocked. Sending a campaign is not enough: Gmail, Outlook, Yahoo and other mailbox providers analyze each email, then place it in the inbox, in the Promotions tab or in the junk folder. Good deliverability means more recipients see your campaigns, and therefore more opens and clicks.
Your sending domain: an authenticated domain in your name inspires more trust than a shared domain (see Why should I customize my sending domain name in Sarbacane Campaigns?).
The quality of your list: contacts who have given their consent, with no invalid addresses (see How do I clean a contact list in Sarbacane Contacts?).
Your recipients' engagement: opens and clicks improve your reputation, complaints damage it.
Your header and content: a recognizable sender, a clear subject, balanced content (see How do I write my campaign content to avoid spam in Sarbacane Campaigns?).
The regularity of your sends: stable volumes, increased gradually on a new domain (see How do I warm up a new sending domain in Sarbacane Campaigns?).
