diff --git a/packages/nodes-base/nodes/EmailSend.node.ts b/packages/nodes-base/nodes/EmailSend.node.ts
index 4db5679d08..9d63f0989a 100644
--- a/packages/nodes-base/nodes/EmailSend.node.ts
+++ b/packages/nodes-base/nodes/EmailSend.node.ts
@@ -152,8 +152,8 @@ export class EmailSend implements INodeType {
 		if(credentials.user || credentials.password) {
 			// @ts-ignore
 			connectionOptions.auth = {
-				user: credentials.user,
-				pass: credentials.password
+				user: credentials.user as string,
+				pass: credentials.password as string,
 			};
 		}
 
diff --git a/packages/nodes-base/nodes/Mandrill/Mandrill.node.ts b/packages/nodes-base/nodes/Mandrill/Mandrill.node.ts
index bd73be095a..a30bb38aea 100644
--- a/packages/nodes-base/nodes/Mandrill/Mandrill.node.ts
+++ b/packages/nodes-base/nodes/Mandrill/Mandrill.node.ts
@@ -816,9 +816,9 @@ export class Mandrill implements INodeType {
 					const metadataUi = this.getNodeParameter('metadataUi', i) as IDataObject;
 					if (!_.isEmpty(metadataUi)) {
 						// @ts-ignore
-						body.message.metadata = _.map(metadataUi.metadataValues, (o) => {
+						body.message.metadata = _.map(metadataUi.metadataValues, (o: IDataObject) => {
 							const aux: IDataObject = {};
-							aux[o.name] = o.value;
+							aux[o.name as string] = o.value;
 							return aux;
 						});
 					}
@@ -826,7 +826,7 @@ export class Mandrill implements INodeType {
 					const mergeVarsUi = this.getNodeParameter('mergeVarsUi', i) as IDataObject;
 					if (!_.isEmpty(mergeVarsUi)) {
 						// @ts-ignore
-						body.message.global_merge_vars = _.map(mergeVarsUi.mergeVarsValues, (o) => {
+						body.message.global_merge_vars = _.map(mergeVarsUi.mergeVarsValues, (o: IDataObject) => {
 							const aux: IDataObject = {};
 							aux.name = o.name;
 							aux.content = o.content;
@@ -835,13 +835,13 @@ export class Mandrill implements INodeType {
 					}
 
 					const attachmentsUi = this.getNodeParameter('attachmentsUi', i) as IDataObject;
-					let attachmentsBinary = [], attachmentsValues = [];
+					let attachmentsBinary: Attachments[] = [], attachmentsValues: Attachments[] = [];
 					if (!_.isEmpty(attachmentsUi)) {
 
 						if (attachmentsUi.hasOwnProperty('attachmentsValues')
 							&& !_.isEmpty(attachmentsUi.attachmentsValues)) {
 							// @ts-ignore
-							attachmentsValues = _.map(attachmentsUi.attachmentsValues, (o) => {
+							attachmentsValues = _.map(attachmentsUi.attachmentsValues, (o: IDataObject) => {
 								const aux: IDataObject = {};
 								// @ts-ignore
 								aux.name = o.name;
@@ -855,12 +855,12 @@ export class Mandrill implements INodeType {
 							&& !_.isEmpty(attachmentsUi.attachmentsBinary)
 							&& items[i].binary) {
 							// @ts-ignore
-							attachmentsBinary = _.map(attachmentsUi.attachmentsBinary, (o) => {
-								if (items[i].binary!.hasOwnProperty(o.property)) {
+							attachmentsBinary = _.map(attachmentsUi.attachmentsBinary, (o: IDataObject) => {
+								if (items[i].binary!.hasOwnProperty(o.property as string)) {
 									const aux: IDataObject = {};
-									aux.name = items[i].binary![o.property].fileName || 'unknown';
-									aux.content = items[i].binary![o.property].data;
-									aux.type = items[i].binary![o.property].mimeType;
+									aux.name = items[i].binary![o.property as string].fileName || 'unknown';
+									aux.content = items[i].binary![o.property as string].data;
+									aux.type = items[i].binary![o.property as string].mimeType;
 									return aux;
 								}
 							});