General steps to follow to get your domain off a blacklist:

1. Identify which blacklist your domain is on Use a blacklist lookup tool to check which blacklists your domain has been added to. You can try tools like MX Toolbox, Blacklist Master, or Spamhaus.
2. Investigate the reason for blacklisting: Determine why your domain has been blacklisted by reviewing the blacklist's website or contacting their support team. Some common reasons include spamming, malware, phishing, or poor email practices.
3. Resolve the underlying issue: Take steps to address the root cause of the blacklisting, such as removing spam email addresses from your mailing list, scanning your website for malware, or improving your email authentication and encryption protocols.
4. Request removal from the blacklist: Follow the delisting process for the blacklist in question. This may involve filling out a form, providing documentation, or emailing the blacklist's support team.
5. Monitor your domain reputation: After your domain has been delisted, continue to monitor your email deliverability and domain reputation using tools like Google Postmaster Tools, SenderScore, or Talos Intelligence.
6. Maintain good email practices: To avoid getting blacklisted in the future, make sure to follow good email practices such as sending only opt-in emails, providing a clear unsubscribe option, and regularly updating your mailing list.

Additional Steps Email Administrators Can Follow:

Here are additional steps that your email administrator can take to prevent your domain from getting blacklisted in the future:

1. Implement email authentication protocols: Implement email authentication protocols such as SPF, DKIM, and DMARC to help prevent spammers from spoofing your domain name and sending fraudulent emails.
2. Monitor email traffic: Monitor your email traffic for any suspicious activity or spamming attempts, and take action to block such traffic.
3. Use a reputable email service provider: Use a reputable email service provider that takes measures to prevent spamming and blacklisting, and offers features such as bounce handling and feedback loops.
4. Check your email content: Check your email content for spam triggers such as excessive use of capital letters, misleading subject lines, or too many hyperlinks, and avoid using them.
5. Maintain a clean email list: Regularly clean your email list by removing inactive or invalid email addresses, and avoid purchasing email lists or using outdated lists.

By implementing these measures, your email administrator can help ensure that your domain remains off blacklists and that your emails are delivered successfully to your recipients.

Reputable blacklist lookup providers:

There are several reputable blacklist lookup providers that you can use to check whether your domain has been blacklisted. Here are some of the most popular and trusted ones:

1. MX Toolbox (https://mxtoolbox.com/blacklists.aspx)
2. Spamhaus (https://www.spamhaus.org/lookup/)
3. Barracuda Reputation Block List (https://www.barracudacentral.org/lookups/)
4. Cisco Talos Intelligence (https://talosintelligence.com/reputation_center/)
5. SURBL (http://www.surbl.org/surbl-analysis)
6. Invaluement (https://www.invaluement.com/lookup/)
7. MultiRBL (http://multirbl.valli.org/lookup/)

These tools allow you to quickly check whether your domain has been added to any popular blacklists and take the necessary steps to remove it. It's recommended to check your domain regularly to prevent any unexpected blacklisting issues.

Steps to follow from a cold email perspective to prevent your domain from getting blacklisted:

1. Use a reputable email service provider: Use a reputable email service provider that follows email best practices and has measures in place to prevent spamming and blacklisting.
2. Get permission: Only send emails to individuals who have given their permission to receive them. Avoid sending unsolicited emails or buying email lists.
3. Use a clean email list: Keep your email list clean by removing inactive or invalid email addresses, and avoid sending emails to bounced or undeliverable addresses.
4. Optimize email content: Avoid using spam trigger words or phrases in your email content, such as "free," "urgent," or "limited time offer." Keep your subject line concise and relevant, and avoid using all capital letters or excessive punctuation.
5. Authenticate your emails: Implement email authentication protocols such as SPF, DKIM, and DMARC to help prevent spammers from spoofing your domain name and sending fraudulent emails.
6. Monitor email metrics: Monitor your email metrics such as open rates, click-through rates, and bounce rates, and take action to improve them if necessary. A high bounce rate or low engagement rate can signal to email providers that your emails are unwanted or low quality, which can lead to blacklisting.

By following these steps, you can help ensure that your cold emails are delivered successfully and avoid the risk of getting blacklisted.