Why are my emails bouncing with T-Online when sent via Klaviyo and what can I do?

Email marketer from MailChimp Community Forums explains that T-Online often has strict policies and can block emails due to various reasons including spam complaints or content filters. Suggests checking MailChimp's deliverability tips and contacting T-Online support.

Email marketer from Email Geeks shares that being on a blocklist can cause deliverability problems. Suggests checking if the sending IP address or domain is on any major blocklists and taking steps to get delisted if necessary.

Email marketer from Reddit shares that when using Klaviyo, bounces could be a result of the shared IP's reputation being negatively affected by other senders. Suggests considering a dedicated IP address for better control over sender reputation, but highlights the need for a proper warmup strategy.

Email marketer from SuperOffice shares information about how important it is to only email those who have explicitly consented to receive email from you.

Email marketer from StackExchange explains that a gradual IP warmup is necessary when switching to a dedicated IP address. Suggests slowly increasing sending volume over time to build a positive sender reputation with ISPs like T-Online.

Email marketer from SendGrid explains the importance of regularly cleaning email lists to remove inactive or invalid email addresses. Suggests using a list verification service to identify and remove problematic addresses.

Email marketer from Email Vendor Guide shares that maintaining a good sender reputation is key to email deliverability. Suggests monitoring sender score, keeping complaint rates low, and segmenting lists to send targeted and relevant content.

Email marketer from Gmass shares information about how important it is to monitor your bounces, and try to keep your bounce rate below 2% or 3%.

Email marketer from Email Geeks explains that T-Online is fussy about the contact information on your webpage.

Email marketer from Litmus explains the importance of email design and content in deliverability. Suggests avoiding spam trigger words, using a clean HTML code, and ensuring emails are mobile-friendly.

Expert from Email Geeks advises against excluding T-Online subscribers during IP warmup.

Expert from Spam Resource explains that understanding bounce messages is crucial for diagnosing deliverability issues, including those with T-Online. Suggests carefully analyzing the bounce codes and messages provided by T-Online to identify the specific reasons for the rejections.

Expert from Word to the Wise shares information about the importance of sender reputation, and ensuring that you have a good email reputation.

Expert from Email Geeks explains that given the shared Klaviyo IP, the T-Online bounces might not be a direct issue with Vytas, but rather someone else on the platform causing the IP block. Klaviyo needs to address this with T-Mobile. Laura suggests reaching out to Klaviyo tech support and requesting a move to a different IP pool.

Expert from Email Geeks suggests waiting until a T-Online bounce occurs on the dedicated IP before reaching out to them. They note T-Online can be particular about DNS configuration.

Documentation from Klaviyo explains that bounces can occur due to invalid email addresses, full inboxes, or server issues. Soft bounces are temporary problems, while hard bounces indicate permanent delivery failures. Suggests monitoring bounce rates and cleaning email lists regularly.

Documentation from Mxtoolbox suggests analyzing the email headers to determine the exact reason for bounces, including potential blocklist hits or authentication failures. They have specific instructions on how to decode the headers.

Documentation from SparkPost explains that proper DNS records (SPF, DKIM, DMARC) are essential for email authentication and improving deliverability. Suggests verifying that these records are correctly configured for the sending domain and that they align with Klaviyo's requirements.

Documentation from RFC explains SMTP (Simple Mail Transfer Protocol). Suggests checking the RFC documentation to get a better understanding of how email is sent.

Documentation from DMARC.org explains that implementing a DMARC policy can help protect against email spoofing and phishing attacks. Suggests setting up a DMARC policy with a 'p=reject' or 'p=quarantine' policy to instruct receiving mail servers on how to handle emails that fail authentication checks.

Documentation from Google explains that they have Postmaster Tools which allow you to analyze data on a domain level, and gives insight into things like reputation, spam, feedback loops, etc. They don't specifically mention T-Online.