Sometimes, specific network configurations can cause issues in Spark, such as trouble sending emails, adding accounts, or syncing data.
IPv4 vs IPv6
Every device connected to the internet is assigned an IP address. This address helps route traffic and identify devices on the network.
IPv4 is the older version, offering around 4.3 billion unique addresses.
IPv6 is the newer version, designed to support the vast growth of internet-connected devices. It offers almost unlimited addresses.
Some networks using IPv6 may cause issues with email delivery in Spark — for example, emails may get stuck in the Outbox due to trouble connecting to SMTP servers. Similarly, some custom email accounts can only be added over an IPv4 network.
Here’s what you can do if you’re facing connection issues:
- Try switching your network settings from IPv6 to IPv4.
- Connect to a different Wi-Fi or mobile network that uses IPv4.
Firewalls and Network Restrictions
Some networks — like public Wi-Fi or those managed by workplaces or internet providers — may block certain connections, websites, or ports. This can result in trouble sending or receiving emails, issues adding new accounts, or problems syncing data or using features like AI tools, Push Notifications, or Badges.
In this case, try these troubleshooting steps:
- Try connecting to another network.
- Ask your network administrator to whitelist:
- Gmail IMAP/SMTP servers
- Port 993
- Spark’s service endpoint: https://app.smartmailcloud.com/
VPN, Proxy, and Antivirus Services
Using VPNs, proxy servers, or some antivirus programs can affect Spark’s performance by creating unstable internet connections. This may lead to issues sending or receiving emails.
We suggest taking the following steps:
- Limit the use of VPNs or proxies when using Spark, unless necessary.
- Try switching to alternative tools that don’t interrupt your email connection.
If you continue to experience issues after checking your network setup, feel free to reach out to our support team — we’re happy to help!