MailRush.io review: cold email automation with warmup, validation and follow-ups. Plans from $19/month with a free 14-day trial. See features and pricing.
Researched and fact-checked by Bartu Cavusoglu · Updated October 26, 2026
MailRush.io is cold email software built for the top of the email marketing funnel. It automates outbound outreach and follow-up emails, and the company describes itself as a cold email service provider that focuses on deliverability. The product is run by Cyber Cast Intl, and the site shows copyright dates from 2019 to 2025.
The platform is aimed at B2B outreach. Users connect mailboxes, import contacts and build multi-step campaigns that send follow-ups on their own. The homepage displays a 4.2 out of 5 rating from 14 reviews, which is self-reported and not independently verified.
The homepage describes a three-step setup. First, users connect their own SMTP/IMAP mailboxes or use a ready-to-go MailRush.io account so they can start sending right away. Second, they import contacts from a CSV file or connect external sources.
Third, they create a campaign. This is a multi-step follow-up sequence that continues sending without manual work. Before launch, users can validate addresses and run a spam score check, and warmup is included to help new mailboxes build a sending reputation.
Deliverability is the main theme. Email validation checks addresses before sending, the spam score check tests messages before they go out, and warmup is included on every plan. A suppression list and unsubscription automation help manage recipients who should not be contacted.
On the campaign side, MailRush.io supports email follow-ups, spintax and personalization. It allows unlimited email accounts with volume distribution controls. Technical teams get API access and webhooks, and Zapier integrations are listed on all plans.
MailRush.io is a cold email automation platform for B2B outreach. It sends multi-step follow-up campaigns and includes email validation, spam checks and warmup. The company focuses on deliverability.
MailRush.io has three plans: Starter at $19 per month, Pro at $39 per month and Scale at $99 per month. Plans differ by sending limits, contact capacity, validation credits and campaign counts.
Yes. Every plan comes with a free 14-day trial. The site says no credit card is required and that users can cancel anytime.
The site positions Starter for solo founders and consultants, Pro for in-house sales teams and small agencies, and Scale for agencies and high-volume teams.
MailRush.io lists Zapier integrations, API access and webhooks on all plans. Mailboxes connect over SMTP/IMAP, and the Scale plan states that all integrations are included.
Yes. Email warmup is included on all three plans, and the plan comparison describes it as unlimited.
Yes. Users can connect their own SMTP/IMAP mailboxes or use a ready-to-go MailRush.io account. Unlimited email accounts are allowed on every plan.
Starter allows up to 1,000 emails per day and 5,000 per month. Pro allows 1,500 per day and 10,000 per month, and Scale allows 3,000 per day and 25,000 per month.