Why are my emails going to spam folder during new subdomain warm up even with good open rates?

Email marketer from Email Geeks shares that it's common for mail streams to land in the spam folder when new, as Gmail wants to see users moving mail from spam to inbox. Reducing volume and sending regularly can improve inbox placement, but it takes time to show results. Alison also notes that Gmail may not report spam complaints on low volumes of messaging, so the absence of reports isn't definitive proof of no complaints.

Email marketer from Email Geeks explains that doubling volume each day can be too aggressive for warming up and recommends increasing volume by 20-30% per day. Sending once a day and using send time optimization is also recommended.

Email marketer from Email on Acid responds that ISPs look beyond open rates to evaluate engagement. Click-through rates, replies, and forwards are strong indicators of positive engagement. If your emails have high open rates but low engagement, ISPs may still filter them as spam.

Email marketer from Neil Patel's blog shares that spam filters analyze email content. Even if your authentication is set up correctly, using spam triggers in your subject line and content (like excessive use of dollar signs, hype words, or all caps) can lead to spam folder placement. Therefore, optimizing your content is important.

Email marketer from Email Geeks recommends to keep going and see if it rebounds. If no rebound in sends 5, 6, and 7 then restart warm up. Use click rates and last click dates to build the first segments since Gmail loves engagement more than anything.

Email marketer from HubSpot shares that sometimes the age of the domain can affect sending reputation. Older domains usually have a good sending history and this is an important factor for email deliverability. If it's too new then its trustworthiness may be questionable which can impact deliverability.

Email marketer from Warrior Forum suggests that inconsistent sending patterns can trigger spam filters, even with a warm IP. Establishing a consistent sending schedule helps ISPs recognize your email as legitimate and maintain a positive reputation.

Email marketer from Quora explains that even with a new subdomain, if your domain or IP has been previously blacklisted, it can cause deliverability issues. Check your domain and IP against common blacklists to identify and resolve any listing issues.

Email marketer from Reddit responds that a likely cause is an aggressive warmup. Even with good open rates initially, Gmail and other providers are cautious of sudden sending volume increases from new subdomains. They recommend gradually increasing sending volume over a longer period to establish a positive reputation.

Email marketer from Litmus answers to maintain a good image to text ratio. Spam filters often flag emails with high image content and very little text. Ensure that your email is balanced with sufficient text content to provide context and avoid triggering spam filters. A good ratio is around 60% text and 40% images.

Email marketer from Marketo recommends to check what type of IP address you are using. Shared or Dedicated. Shared IP addresses have a reputation which can affect deliverability. Dedicated IP addresses are clean and you can work on warming them up which can have a positive impact on deliverability.

Email marketer from SendGrid shares that using a double opt-in process ensures that subscribers genuinely want to receive your emails. This reduces the likelihood of spam complaints and improves your sender reputation, leading to better inbox placement.

Email marketer from Campaign Monitor responds to avoid URL shorteners and Use a custom tracking domain. Spammers often use URL shorteners to hide the true destination of a link. Using long or shortened links can negatively affect your sender reputation and trigger spam filters. Use a custom tracking domain, branded links.

Expert from Email Geeks shares a case where a client's emails were going to spam due to links pointing to shared EPS domains. Switching to links pointing to their own domain resolved the issue.

Expert from Word to the Wise shares that inbox placement rates might differ from seed list results. Email might be delivered to the inbox of seed addresses but still land in the spam folder for real users. It could be due to the content or other factors not captured by seed testing, or ESP might treat seed lists differently.

Expert from Spam Resource explains that the methods used to acquire email addresses can significantly impact deliverability. Even with good open rates, addresses obtained through co-registration, incentivized sign-ups, or data appending are often low-quality and generate spam complaints, negatively affecting inbox placement during warmup.

Expert from Email Geeks suggests the volume may be too low to establish anything definitive. He recommends ensuring DKIM, SPF, and DMARC are properly configured, continuing the warming process to identify and resolve issues, and allowing the reputation to stabilize as more data is gathered.

Expert from Spam Resource explains that during subdomain warm-up, a lack of established reputation is a vulnerability, even with authentication. ESPs and ISPs are likely more sensitive to negative signals such as spam complaints, bounces, and low engagement as the sender builds a history.

Documentation from Microsoft says that IP reputation, even on dedicated sending domains, plays a role in deliverability. If the IP address associated with the new subdomain was previously used for spam or has a poor history, it can negatively impact inbox placement despite proper authentication.

Documentation from Mailchimp explains that poor list hygiene can affect deliverability, even with a new subdomain. Sending to old, unengaged, or purchased lists increases the risk of spam complaints, which harms sender reputation. Regularly cleaning your list and focusing on engaged subscribers will improve inbox placement.

Documentation from RFC says that though SPF, DKIM and DMARC might be set up, they could be misconfigured or incomplete. Check for common issues such as SPF records not including all sending sources, DKIM signatures failing verification, or DMARC policies not being enforced.

Documentation from Google explains that even with proper authentication (SPF, DKIM, DMARC), low sender reputation can cause emails to land in spam. Sender reputation is influenced by factors like user complaints, spam trap hits, and sending practices. Good open rates alone don't guarantee inbox placement if overall reputation is poor.