Why are Gmail emails deferred or undelivered only to Italian subscribers after switching ESPs and subdomains?

Email marketer from Gmass says that Gmail might be throttling emails to Italian users if the new subdomain is sending a high volume of emails quickly. Gradually increasing sending volume is advised.

Email marketer from Stack Overflow suggests that some older email standards may be triggering spam filters for certain regions, such as Italy. Reviewing email headers and ensuring compliance is important.

Email marketer from Sender explains that low engagement from Italian subscribers (low open rates, clicks) could be negatively impacting deliverability. Gmail uses engagement as a key factor in determining email placement.

Email marketer from Mailjet suggests that the language encoding used for Italian subscribers might be causing issues. Special characters or incorrect encoding can sometimes trigger spam filters or cause display problems leading to low engagement.

Email marketer from Neil Patel's Blog explains that a possible cause could be a new IP address not being warmed up correctly with Gmail, especially if a high volume of emails are being sent immediately. Different regions might react differently during the warmup phase.

Email marketer from EmailOctopus suggests that problems with the Italian subscriber list itself, such as incorrect formatting or outdated addresses, may contribute to deferrals. It also suggests cleaning the list

Email marketer from Quora suggests that the lack of feedback loops (especially those specific to the Italian region) may obscure the reason for poor deliverability. Setting up feedback loops with major ISPs can provide valuable data.

Email marketer from Reddit explains that a previously poor IP reputation with Italian ISPs or Gmail users could be affecting deliverability, even with a new ESP. Monitoring IP reputation specifically in the Italian region is suggested.

Email marketer from ActiveCampaign explains that tracking code can sometimes trigger spam filters. If Italian subscribers have stricter anti-spam measures, excessive or poorly implemented tracking might be a factor.

Email marketer from Litmus suggests that authentication issues (SPF, DKIM, DMARC) might be more pronounced with Italian Gmail users. Verifying that these are properly configured for the new subdomain is crucial.

Expert from Email Geeks suggests that 2 days is not a long enough warmup period and the behavior is expected. Also recommends waiting to see what happens, as troubleshooting during the initial warmup phase (before day 4 or 5) can be too random and a waste of time. The problem often resolves itself with patience.

Expert from Spam Resource explains that some Italian ISPs have unique spam filtering practices or agreements with Gmail that might disproportionately impact deliverability. They may be more sensitive to new subdomains or changes in sending patterns.

Expert from Email Geeks suggests checking if a different language module/encoding for Italian is causing technical issues. But suggests only investigating this if proving action is needed.

Expert from Word to the Wise recommends a gradual IP warmup schedule specific to the Italian region. This might involve sending smaller volumes of email to Italian subscribers initially and monitoring deliverability closely. You may want to use a different warmup plan for different regions.

Documentation from Google Support highlights that new subdomains need to build a reputation, especially when sending to Gmail. It is important to adhere to Gmail's sender guidelines during the warmup process to avoid deliverability issues.

Documentation from MXToolbox explains that using their tools to run domain health checks can expose issues with DNS records, blacklisting, or other configuration problems that might disproportionately affect deliverability in certain regions.

Documentation from Gmail Postmaster Tools says to use their tools to identify deliverability problems for Italian subscribers, such as IP reputation, spam complaints, and authentication issues. This should give you insights specific to your domain and sending practices.

Documentation from RFC Editor highlights that deferred messages often indicate temporary delivery issues. Analyzing SMTP error codes from bounce messages could provide clues as to why Gmail is deferring specifically Italian emails.