What are the best practices for sending email to Polish providers like Interia to avoid throttling?
Summary
What email marketers say11Marketer opinions
Email marketer from MailerCheck explains that email throttling is a process by which a mail service provider (MSP) like Gmail, Outlook, or Yahoo! intentionally slows down the rate at which it accepts email from a particular sender. They recommend improving sender reputation, using dedicated IP address and warming it up, authenticating email and cleaning email list.
Email marketer from Omnisend notes that, when sending emails, ISPs and email providers scan them for spam triggers to determine if they should deliver the message, filter it, or reject it altogether. They suggest cleaning your email lists, getting consent, writing a great subject line and properly authenticating to avoid spam filters.
Email marketer from SparkPost shares that good email deliverability means that your messages are landing in your recipients' inboxes and not in the spam folder. They recommend authenticating your email, cleaning your list, segmenting your audience, monitoring your reputation, and providing value.
Email marketer from Reddit shares that one thing you could try is looking into DKIM. It can help prove to mail providers that you are who you say you are. It will require DNS access to set up properly
Email marketer from Reddit notes that blacklists are lists of IP addresses and domains that have been identified as sources of spam. If you are on a blacklist, your emails may be blocked or sent to the spam folder. They recommend checking your IP address and domain against known blacklists. They also share that there are paid services to automatically monitor this.
Marketer from Email Geeks shares that they've been told to start at 1,000 messages per day in Poland for any MBP, then increase volume 12% every 2-3 days. If the MBP blocks, do not increase volume; reduce volume and wait until blocking stops.
Email marketer from SenderGuardian shares that warming up an IP address involves gradually increasing the volume of email sent from that IP over a period of time. This helps to establish a positive sender reputation with ISPs. SenderGuardian suggest starting with low volumes and gradually increasing the number of emails sent each day.
Email marketer from Litmus explains to avoid spam filters by avoiding spam trigger words, having good IP reputation, getting recipients to add you to their address book and have good authentication. It is also good to have a dedicated IP and domain.
Email marketers from Email Geeks discuss Interia throttling. Nick is experiencing general throttling for 2k minutes and support hasn't responded. Patrick suggests considering volume limits, authentication, and specific bounce messages, and that volume may be playing a role due to shared IPs. Nick states he has tried requesting delistings with no impact. They both agree the volume isn't excessive. Nick notes that polish providers have a pay to play model, including a certification program. Patrick adds European providers tend to throttle more aggressively and prefer authentication/domain alignment, suggesting CNAMES for return path domains. Nick adds the mail engineers have not done any specific testing.
Email marketer from EmailVendorSelection.com answers that throttling is when an ISP temporarily blocks emails from a specific source (IP or domain) that exceed certain volume limits or have a poor sender reputation. To avoid it, they recommend warming up your IP address, segmenting your list, and monitoring your sending reputation.
Email marketer from GMass explains that email deliverability refers to your ability to successfully deliver emails to your subscribers’ inboxes. To improve deliverability, they suggest authenticating your email, cleaning your list, warming up your IP address, monitoring your reputation, and segmenting your audience.
What the experts say2Expert opinions
Expert from Spamresource explains the importance of sender reputation when sending emails. They note that having a poor sender reputation will severely affect your email deliverability. They recommend implementing best practices in authentication, list hygiene, and content creation.
Expert from Word to the Wise explains that throttling happens when an ISP temporarily delays or refuses to accept messages from an IP or domain. This is often due to perceived spam-like behavior or high volume. They recommend maintaining a good sending reputation by authenticating, segmenting lists, and monitoring volume.
What the documentation says4Technical articles
Documentation from RFC-Editor explains that DMARC (Domain-based Message Authentication, Reporting & Conformance) builds upon SPF and DKIM to provide a way for domain owners to specify how receiving mail servers should handle messages that fail authentication checks. DMARC also provides a reporting mechanism that allows domain owners to receive feedback about authentication results.
Documentation from Gmail Help explains that to ensure Gmail delivers your messages, authenticate your email with SPF, DKIM, and DMARC. Send consistent volume. Avoid sending unwanted mail. Monitor your sender reputation in Postmaster Tools. Follow Gmail's sender guidelines. If you send marketing emails, use the List-Unsubscribe header.
Documentation from RFC-Editor explains DomainKeys Identified Mail (DKIM) provides a way to authenticate email messages by digitally signing them with a private key. Receiving mail servers can then verify the signature using the public key published in the domain's DNS record. DKIM helps to ensure that the message has not been altered in transit and that it is coming from an authorized source.
Documentation from RFC-Editor explains Sender Policy Framework (SPF) allows domain owners to specify which mail servers are permitted to send email on behalf of their domain. The SPF record contains a list of authorized IP addresses or domain names. Receiving mail servers can then verify the SPF record to ensure that incoming mail from the domain is coming from an authorized source.