Deliverability Playground

Test and optimize your email deliverability

Test Your Email

Best Practices

  • Keep subject under 50 characters
  • Avoid ALL CAPS and excessive punctuation
  • Personalize with recipient name
  • Use clear sender name and reply-to
  • Include unsubscribe link
  • Balance text and images (60/40)
  • Authenticate with SPF, DKIM, DMARC
  • Warm up new domains gradually

ISP Spam Filters

GmailContent filtering Engagement is key, avoid spam words
YahooEngagement-based Warm up slowly, maintain good reputation
OutlookSmartScreen + Junk Authenticate SPF/DKIM/DMARC
AOLReputation-based Monitor bounce rates carefully
iCloudContent + IP reputation Keep content clean and simple
ComcastCloudmark Avoid URL shorteners
OrangeVade Secure French ISP - respect GDPR
Free.frInternal Low volume recommended
SFRInternal + Vade Authenticate properly
GMXContent-based German ISP - strict rules
ProtonMailAggressive Privacy-focused users
ZohoSpamAssassin Business users mainly

Common Spam Trigger Words

Avoid these words to improve deliverability:

freewinnercongratulationsurgentact nowlimited timeclick herebuy noworder nowspecial offerexclusive dealrisk freeno obligationguaranteepromisecreditcashmoneyearnincomeprofitdiscountsavecheapbonusprizemillionbillioninvestmentopportunityaction requiredverifyconfirmaccountsuspendedpasswordsecurityalertwarningbankpaypalamazonapplemicrosoftirslotteryinheritance

Safe Alternatives

complimentary no cost valued customer thank you invitation update news announcement resource guide insight tips
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