"Be careful with this message. The email contains a suspicious link that was used to steal personal information. Unless you trust the sender, don't click links or reply with personal information"

"Be careful with this message. Similar messages were used to steal people's personal information. Unless you trust the sender, don't click links or reply with personal information."

How to avoid Gmail marking your emails spam due to suspicious URLs

1. Blacklisted Domain
   URLs with blacklisted domains are a possible reason for the warning. Check if your URL domain and sender domain are blacklisted with anti-spam services such as Spamhaus, Spamcop, Barracuda, and others. If yes, then raise a de-list request to the service.

1. Don't include URLs with multiple redirections
   Multiple redirections are a common trick used by spammers. When contacts encounter multiple redirections, they feel insecure and mark the email as spam. So, ensure that the URLs redirect straight to the desired page.

1. Don't include shortened URLs from public services
   If the domain of a shortened URL is blacklisted, URLs are considered suspicious. So, avoid publicly available blacklisted URL shorteners.

1. Don't seek contacts' personal information 
   URLs should not be used to seek personal information such as email address, passwords, residential address, phone number, and credit card information.

1. Avoid suspicious/spammy phrases in the URL or in the page redirected from the URL.
   Phrases such as "online dating", "lose weight", "please help", "extra income", and "donate" make your contacts doubt the legitimacy your emails and mark them as spam. Send test emails to your Gmail account to identify if anything is wrong before sending the actual campaign.

1. Maintain a proper WHOIS registry for your domain
   Spam filters check the WHOIS registry for anything suspicious. The information in the registry should be original and updated regularly.

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