Why am I seeing Verizon Media PH01 errors and how can I resolve them?

Email marketer from Email Geeks shares that they saw a client with same SURBL on Yahoo last week and to be sure to delist with SURBL and Norton. It appears that they made a change to their algorithms and a series of clients are showing up flagged, since it is happening at multiple ESPs. It appears to have lifted on its own on Sunday and Yahoo said they lifted before Surbl did

Email marketer from Reddit suggests ensuring that your sending domain has proper authentication records (SPF, DKIM, DMARC) configured correctly, as this helps to establish trust with Verizon Media and reduce the likelihood of being flagged as phishing.

Email marketer from Email Deliverability Blog suggests setting up feedback loops (FBLs) with Verizon Media to receive reports on spam complaints. Addressing these complaints promptly can improve your sending reputation and reduce PH01 errors.

Email marketer from Email Geeks shares that if you send through Iterable the issue was on their side as a Clidfront.net link got listed by SURBL and VMG removed the listing yesterday afternoon.

Email marketer from Stack Overflow shares that if you are on a shared hosting environment, the actions of other users can impact your sending reputation, leading to PH01 errors. Consider using dedicated IPs or reputable email sending services to avoid this issue.

Email marketer from Quora recommends avoiding the use of URL shorteners in emails, as they are often associated with spam and phishing. Using full, transparent URLs can help improve trust and reduce the likelihood of PH01 errors.

Email marketer from Email Sender Forum shares that a common cause for PH01 errors is the inclusion of URLs or domains in the email content that are blacklisted or associated with phishing activities. They suggest checking URLs against popular blacklists.

Email marketer from Email List Provider suggests regularly cleaning your email list to remove inactive or invalid addresses. Sending emails to engaged recipients improves your sender reputation and reduces the risk of being marked as a spammer, which can prevent PH01 errors.

Email marketer from Sending Service Forum shares that Spreading out your email sends and avoiding sudden spikes in volume can help maintain a consistent sending reputation, and prevent triggering spam filters, including those causing PH01 errors.

Email marketer from Email Marketing Pro Blog recommends reviewing email content for any suspicious elements, such as URL shorteners, redirects, or language commonly used in phishing emails. Making content adjustments can prevent the email being marked as suspicious.

Email marketer from Mail Server Forum points out that a poor IP reputation can trigger PH01 errors. Monitor your IP reputation using tools like Sender Score and take steps to improve it by addressing spam complaints and practicing good sending hygiene.

Expert from Word to the Wise shares that Verizon's filtering systems are constantly evolving. Staying up-to-date on best practices for email authentication and content creation can help you avoid PH01 errors.

Expert from Spam Resource explains that checking your email content for elements that commonly trigger phishing filters, such as suspicious links or wording, is a good first step in resolving PH01 errors. They recommend using tools to scan content before sending.

Expert from Email Geeks explains that PH01 is a phishing error. The most likely reason is that something linked was hosting a phishing site. Alternatively, one of the client accounts was compromised and the hacker was sending out phishing mail through them which contaminated their IP / authentication / mailstream. Problem triggered Verizon’s phishing filters and a review of security is in order. Authentication is irrelevant, if their account is compromised then every bit of phish is sent out with the same authentication as their regular email.

Documentation from DMARC.org explains that implementing a strict DMARC policy (p=reject) can help prevent unauthorized use of your domain for phishing and spoofing, which reduces the chance of your emails being flagged with a PH01 error when legitimate emails are sent.

Documentation from Verizon Media Postmaster explains that a 554 PH01 error indicates that the email was not accepted for policy reasons, specifically due to suspected phishing content. The error occurs when the email content or linked websites are flagged as potential phishing attempts by Verizon Media's filters.

Documentation from SPF-record.com highlights that incorrect or incomplete SPF records can lead to deliverability issues, including PH01 errors. Ensuring that your SPF record includes all authorized sending sources is crucial for authentication.

Documentation from Google Postmaster Tools highlights that While not directly Verizon, monitoring your sending reputation through tools like Google Postmaster Tools gives a broader view of email health and can help in identify reputation issues. Consistent monitoring helps ensure emails avoid issues like PH01 errors.

Documentation from DKIM.org states that correctly implementing DKIM signatures ensures that the email content has not been altered in transit and verifies the sender's identity. This helps to improve deliverability and reduce the chances of being flagged with PH01 errors.